add proxy setter for easier testing
fix ObjectSelect::getValueOptions() recursion
same fix as e114a93ead61e9cf9db0e501c0fd3451e9ff9d60 for checkbox and radio
fix repository find method return handling
code cleaning
cs fix
form element tests refactoring
add new form element exception for invalid repository return types
fix docblock
fix copyright notice
cs fixes
add `GuardUtils` usage
fix exception inheritance and cs
add @covers annotation
Merge pull request #404 from stefanotorresi/fix/form-elements

Fix form elements