base_parser.py: support conditions checking for empty string #653
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base_parser.py did not support conditional directives that were comparing to empty strings (e.g.
!if $(MY_VAL) == ""
,!if $(MY_VAL) != "". The logic in
_TokenizeConditional, was setting
modeto QUOTE_MODE twice because the token length was zero for an empty quote (
len(token) == 0`).This PR Updates the logic to not enter QUOTE_MODE when its already in QUOTE_MODE, and to fall over to end of QUOTE_MODE.