Core/Dungeon Finder: Fix a crash in Join when there are no dungeons available for that group (And probably other random crashes that appear when having DF enabled)

Core/Dungeon Finder: Tab2spaces + remove trailing spaces in LFG* files.

Notes to self:
- assign NULL to a pointer parameter will not change the pointer value outside the scope of the function
- deleting a const_iterator can lead to mem corruption

--HG--
branch : trunk

src/server/game/DungeonFinding/LFGMgr.h

@@ -172,7 +172,7 @@ struct LfgJoinResultData
     LfgJoinResultData(): result(LFG_JOIN_OK), state(LFG_ROLECHECK_DEFAULT), lockmap(NULL) {}
     LfgJoinResult result;
     LfgRoleCheckState state;
-    LfgLockStatusMap* lockmap;    
+    LfgLockStatusMap* lockmap;
 };
 
 // Data needed by SMSG_LFG_UPDATE_PARTY and SMSG_LFG_UPDATE_PLAYER
@@ -324,7 +324,7 @@ class LFGMgr
         LfgProposal* FindNewGroups(LfgGuidList& check, LfgGuidList& all);
         bool CheckGroupRoles(LfgRolesMap &groles, bool removeLeaderFlag = true);
         bool CheckCompatibility(LfgGuidList check, LfgProposal*& pProposal);
-        LfgLockStatusMap* CheckCompatibleDungeons(LfgDungeonSet& dungeons, PlayerSet& players, bool returnLockMap = true);
+        LfgLockStatusMap* GetCompatibleDungeons(LfgDungeonSet& dungeons, PlayerSet& players, bool returnLockMap = true);
         void SetCompatibles(std::string concatenatedGuids, bool compatibles);
         LfgAnswer GetCompatibles(std::string concatenatedGuids);
         void RemoveFromCompatibles(uint64 guid);