vt730: potentials not work after uninstall Project Module

I cleanup unneded modules. I use a script:
...

$module = Vtiger_Module::getInstance('Project');<br> if ($

module) $module->delete();
After I delete the Project module, I become Error 500 if I will see a potentials site. If I reinstall the Module, Potentials works again
Why need Potentials the Projects?

closed with commit 5a631fa5

changed the description

changed milestone to %8.2.0