Python: False positive for blank space characters

https://github.com/github/codeql/blob/main/python/ql/src/Functions/ConsistentReturns.ql

return "" is being interpreted as a implicit return, but it is actually an explicit return (blankspace).

Start by reading python/ql/src/Functions/ConsistentReturns.ql and trace how return "" is classified. Confirm the query distinguishes this explicit return from an implicit return, then verify the existing query behavior with the repository's relevant tests if available.

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