Improve Error-Message when @var annotation in entity object is omitted
When the @var annotation is missing in an entity object the ValidationResolver throws a notice:
Notice: Undefined index: var in .../TYPO3_Flow_Validation_ValidatorResolver_Original.php line 251
This tells nothing about the actual problem (that the @var in the comment of a property was forgotten).
Improve this errormessage to make the search for the error more FLOWing :-)