bcosca/fatfree — pull request #708 by ikkez (2014-10-21 12:40:10+00:00)
Title: fix user error in call function

just noticed that `$this->stringify()` had a missing argument.
But then i saw that the whole condition is redundant, because `is_string($func)` was already checked in the parent if condition at https://github.com/bcosca/fatfree/blob/dev/lib/base.php#L1389
So i think it's fine to clean it up here.