Core/Commands: Added ".npc set phase" command error message for invalid phaseid

Closes #14927

sql/updates/world/6.x/2016_06_05_04_world.sql

@@ -0,0 +1,3 @@
+DELETE FROM `trinity_string` WHERE `entry`=5007;
+INSERT INTO `trinity_string` (`entry`,`content_default`) VALUES
+(5007,"Uses invalid phaseID.");

src/server/game/Miscellaneous/Language.h

@@ -1069,7 +1069,7 @@ enum TrinityStrings
     LANG_COMMAND_NO_FROZEN_PLAYERS      = 5004,
     LANG_COMMAND_LIST_FREEZE            = 5005,
     LANG_COMMAND_PERMA_FROZEN_PLAYER    = 5006,
-    //                                  = 5007, unused
+    LANG_PHASE_NOTFOUND                 = 5007,
     LANG_INSTANCE_CLOSED                = 5008,
     LANG_COMMAND_PLAYED_TO_ALL          = 5009,
     LANG_NPCINFO_LINKGUID               = 5010,

src/server/scripts/Commands/cs_npc.cpp

@@ -1106,7 +1106,13 @@ public:
         if (!*args)
             return false;
 
-        uint32 phase = (uint32) atoi((char*)args);
+        uint32 phaseID = uint32(atoi((char*)args));
+        if (!sPhaseStore.LookupEntry(phaseID))
+        {
+            handler->SendSysMessage(LANG_PHASE_NOTFOUND);
+            handler->SetSentErrorMessage(true);
+            return false;
+        }
 
         Creature* creature = handler->getSelectedCreature();
         if (!creature || creature->IsPet())
@@ -1117,8 +1123,8 @@ public:
         }
 
         creature->ClearPhases();
-        creature->SetInPhase(phase, true, true);
-        creature->SetDBPhase(phase);
+        creature->SetInPhase(phaseID, true, true);
+        creature->SetDBPhase(phaseID);
 
         creature->SaveToDB();