Core/Dungeon Finder: Added condition to avoid unnecessary checks to the joining result.

src/server/game/DungeonFinding/LFGMgr.cpp

@@ -539,6 +539,9 @@ void LFGMgr::Join(Player* plr, uint8 roles, const LfgDungeonSet& selectedDungeon
             }
         }
 
+        // it could be changed
+        if (joinData.result == LFG_JOIN_OK)
+        {
             // Expand random dungeons and check restrictions
             if (rDungeonId)
                 dungeons = GetDungeonsByRandom(rDungeonId);
@@ -548,6 +551,7 @@ void LFGMgr::Join(Player* plr, uint8 roles, const LfgDungeonSet& selectedDungeon
             if (dungeons.empty())
                 joinData.result = grp ? LFG_JOIN_PARTY_NOT_MEET_REQS : LFG_JOIN_NOT_MEET_REQS;
         }
+    }
 
     // Can't join. Send result
     if (joinData.result != LFG_JOIN_OK)