Bug feedback

[a5978445]

As shown in figure ：about the isEqual Method
When my ProBuffObject has array Members ；call isEqual Method， This time to perform statements：" [self.voiceArray isEqualToArray:otherMessage.voiceArray]"
when this member ==nil ,is always return No;
This is not the correct results，
Suggest to add judge statements “self.voiceArray==otherMessage.voiceArray ”