Core/Quest: Fix issues reported by static analysis

src/server/game/Handlers/GroupHandler.cpp

@@ -991,7 +991,7 @@ void WorldSession::HandleRequestPartyMemberStatsOpcode(WorldPacket &recvData)
     data.put<uint64>(maskPos, auraMask);                    // GROUP_UPDATE_FLAG_AURAS
 
     if (updateFlags & GROUP_UPDATE_FLAG_PET_GUID)
-        data << uint64(pet->GetGUID());
+        data << uint64(ASSERT_NOTNULL(pet)->GetGUID());
 
     data << std::string(pet ? pet->GetName() : "");         // GROUP_UPDATE_FLAG_PET_NAME
     data << uint16(pet ? pet->GetDisplayId() : 0);          // GROUP_UPDATE_FLAG_PET_MODEL_ID