def _get_value(self, entity):
if entity._projection:<EOL><INDENT>if self._name not in entity._projection:<EOL><INDENT>raise UnprojectedPropertyError(<EOL>'<STR_LIT>' % (self._name,))<EOL><DEDENT><DEDENT>return self._get_user_value(entity)<EOL>
Internal helper to get the value for this Property from an entity.

        For a repeated Property this initializes the value to an empty
        list if it is not set.