'Using a 0 rather than skipping the group entirely if nothing is found

How can I use a 0 as a "placeholder" here?

=QUERY(Data!A1:G578, "select G, sum(C) where D='Income' group by G label sum(C) 'Total Income'")

So that

Month Total Income
August 2021 $784.59
October 2021 $200.00
November 2021 $312.74

becomes

Month Total Income
August 2021 $784.59
September 2021 $0.00
October 2021 $200.00
November 2021 $312.74

The quickest hacky fix would be just to have an entry of 0$ for September in the data somewhere, but I am wondering if there is a more ""professional"" way to do it



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