[TYPO3-core] RFC #7357: Use exceptions to detect missing user function

[Martin Kutschker]

This is a SVN patch request

Type: Feature

Branches: trunk

BT reference: http://bugs.typo3.org/view.php?id=7357

Problem: t3lib_div::callUserFunction() returns FALSE when the function 
could not be found/called. This makes it impossible to call functions 
which also return FALSE.

Solution: Raise an exception on error. Change $silent into $errorMode 
with the meaning 1=silent and 2=exectption. To be compatible any true 
value except 2 means silent.

Masi
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