ConvertMappingCommand and GenerateEntitiesCommand both use the DisconnectedClassMetadataFactory, which allows metadata manipulation without loading the associated classes. Commit a36bea broke these two commands by adding a bailout condition in ClassMetadataFactory::populateDiscriminatorValue which checks $metadata->reflClass->isAbstract(). If the DisconnectedClassMetadataFactory is being used, $metadata->reflClass will always be null, causing a fatal error, "Fatal error: Call to a member function isAbstract() on null".
This commit adds a check to see if $metadata->reflClass is set before checking isAbstract.
4b10db3a43