Core&Tools: Fix multiple issues found by a static code coverage tool

src/server/game/Entities/Object/Object.cpp

@@ -2230,8 +2230,6 @@ TempSummon* Map::SummonCreature(uint32 entry, Position const& pos, SummonPropert
         case UNIT_MASK_MINION:
             summon = new Minion(properties, summoner, false);
             break;
-        default:
-            return NULL;
     }
 
     if (!summon->Create(sObjectMgr->GenerateLowGuid(HIGHGUID_UNIT), this, phase, entry, vehId, team, pos.GetPositionX(), pos.GetPositionY(), pos.GetPositionZ(), pos.GetOrientation()))