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/LFGScripts.h

@@ -28,8 +28,8 @@ class Group;
 
 class LFGScripts: public GroupScript, PlayerScript
 {
-	public:
-		LFGScripts();
+    public:
+        LFGScripts();
 
         // Group Hooks
         void OnAddMember(Group* group, uint64 guid);
@@ -37,8 +37,8 @@ class LFGScripts: public GroupScript, PlayerScript
         void OnDisband(Group* group);
         void OnChangeLeader(Group* group, uint64 newLeaderGuid, uint64 oldLeaderGuid);
         void OnInviteMember(Group* group, uint64 guid);
-		
-		// Player Hooks
+
+        // Player Hooks
         void OnLevelChanged(Player* player, uint8 newLevel);
         void OnLogout(Player* player);
         void OnLogin(Player* player);