Respect ignoring undefined variables in else blocks #239
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In #189 we introduced special handling for variables used in
elseblocks, but since it didn't use the normal processing system, we broke respecting the existing options for ignoring undefined variables likeallowUndefinedVariablesInFileScope,validUndefinedVariableNames, andvalidUndefinedVariableRegexp. This PR makes sure that the special handling respects those options.Fixes #238