'Is there a way to remove self closing tags in a JMX file?

I am writing a python script that takes a Jmeter script(jmx file) and I want to remove the default configs (User defined variables, Cookie manager etc.) that comes from the recording template. The recording template XML looks like this:

<hashTree>
      <Arguments guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments">
          <elementProp name="host" elementType="Argument">
            <stringProp name="Argument.name">host</stringProp>
            <stringProp name="Argument.value">www.example.com</stringProp>
            <stringProp name="Argument.metadata">=</stringProp>
          </elementProp>
          <elementProp name="scheme" elementType="Argument">
            <stringProp name="Argument.name">scheme</stringProp>
            <stringProp name="Argument.value">https</stringProp>
            <stringProp name="Argument.metadata">=</stringProp>
          </elementProp>
        </collectionProp>
      </Arguments>
      <hashTree/>
      <ConfigTestElement guiclass="HttpDefaultsGui" testclass="ConfigTestElement" testname="HTTP Request Defaults" enabled="true">
        <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
          <collectionProp name="Arguments.arguments"/>
        </elementProp>
        <stringProp name="HTTPSampler.domain">www.example.com</stringProp>
        <stringProp name="HTTPSampler.port"></stringProp>
        <stringProp name="HTTPSampler.protocol">https</stringProp>
        <stringProp name="HTTPSampler.contentEncoding"></stringProp>
        <stringProp name="HTTPSampler.path"></stringProp>
        <stringProp name="HTTPSampler.concurrentPool">6</stringProp>
        <stringProp name="HTTPSampler.connect_timeout"></stringProp>
        <stringProp name="HTTPSampler.response_timeout"></stringProp>
      </ConfigTestElement>
      <hashTree/>
      <CookieManager guiclass="CookiePanel" testclass="CookieManager" testname="HTTP Cookie Manager" enabled="true">
        <collectionProp name="CookieManager.cookies"/>
        <boolProp name="CookieManager.clearEachIteration">false</boolProp>
        <boolProp name="CookieManager.controlledByThreadGroup">false</boolProp>
      </CookieManager>
      <hashTree/>
      <ThreadGroup guiclass="ThreadGroupGui" testclass="ThreadGroup" testname="Thread Group" enabled="true">
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <elementProp name="ThreadGroup.main_controller" elementType="LoopController" guiclass="LoopControlPanel" testclass="LoopController" testname="Loop Controller" enabled="true">
          <boolProp name="LoopController.continue_forever">false</boolProp>
          <stringProp name="LoopController.loops">1</stringProp>
        </elementProp>
        <stringProp name="ThreadGroup.num_threads">1</stringProp>
        <stringProp name="ThreadGroup.ramp_time">1</stringProp>
        <longProp name="ThreadGroup.start_time">1370726934000</longProp>
        <longProp name="ThreadGroup.end_time">1370726934000</longProp>
        <boolProp name="ThreadGroup.scheduler">false</boolProp>
        <stringProp name="ThreadGroup.duration"></stringProp>
        <stringProp name="ThreadGroup.delay"></stringProp>
        <boolProp name="ThreadGroup.same_user_on_next_iteration">true</boolProp>
      </ThreadGroup>
      ...
      ...
</hashTree>

I want to remove the below part from it

<Arguments guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
  <collectionProp name="Arguments.arguments">
    <elementProp name="host" elementType="Argument">
      <stringProp name="Argument.name">host</stringProp>
      <stringProp name="Argument.value">www.example.com</stringProp>
      <stringProp name="Argument.metadata">=</stringProp>
    </elementProp>
    <elementProp name="scheme" elementType="Argument">
      <stringProp name="Argument.name">scheme</stringProp>
      <stringProp name="Argument.value">https</stringProp>
      <stringProp name="Argument.metadata">=</stringProp>
    </elementProp>
  </collectionProp>
</Arguments>
<hashTree/>
<ConfigTestElement guiclass="HttpDefaultsGui" testclass="ConfigTestElement" testname="HTTP Request Defaults" enabled="true">
  <elementProp name="HTTPsampler.Arguments" elementType="Arguments" guiclass="HTTPArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
    <collectionProp name="Arguments.arguments"/>
  </elementProp>
  <stringProp name="HTTPSampler.domain">www.example.com</stringProp>
  <stringProp name="HTTPSampler.port"></stringProp>
  <stringProp name="HTTPSampler.protocol">https</stringProp>
  <stringProp name="HTTPSampler.contentEncoding"></stringProp>
  <stringProp name="HTTPSampler.path"></stringProp>
  <stringProp name="HTTPSampler.concurrentPool">6</stringProp>
  <stringProp name="HTTPSampler.connect_timeout"></stringProp>
  <stringProp name="HTTPSampler.response_timeout"></stringProp>
</ConfigTestElement>
<hashTree/>
<CookieManager guiclass="CookiePanel" testclass="CookieManager" testname="HTTP Cookie Manager" enabled="true">
  <collectionProp name="CookieManager.cookies"/>
  <boolProp name="CookieManager.clearEachIteration">false</boolProp>
  <boolProp name="CookieManager.controlledByThreadGroup">false</boolProp>
</CookieManager>
<hashTree/>

I am currently doing this but this is not removing the self closing hashTrees from the JMX file.

# node is the top-most hashTree in 1st XML snippet
for child in node:
  if child.tag == 'ThreadGroup':
    break
  node.remove(child)

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'Is there a way to remove self closing tags in a JMX file?

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