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Igor Wiedler 427a5122d5 [feature/template-engine] Fix negative variable expressions
compile_tag_if had the flawed approach of adding an isset statement for
all variables to the beginning of the if. This fails for negative
expressions, and checking those takes a considerable effort.

The easier solution is to make the variable expression itself
conditional, defaulting to null if it is not set.

Thanks to naderman for the solution.

PHPBB3-9726
2011-04-25 23:19:36 -04:00

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