got rid of exit crash and warning messages 'Trying to access deleted singleton'

--HG--
branch : product-engine

indra/newview/llagentpicksinfo.cpp

@@ -47,7 +47,8 @@ class LLAgentPicksInfo::LLAgentPicksObserver : public LLAvatarPropertiesObserver
 
 	~LLAgentPicksObserver()
 	{
-		LLAvatarPropertiesProcessor::getInstance()->removeObserver(gAgent.getID(), this);
+		if (LLAvatarPropertiesProcessor::instanceExists())
+			LLAvatarPropertiesProcessor::getInstance()->removeObserver(gAgent.getID(), this);
 	}
 
 	void sendAgentPicksRequest()