fix(Scripts/Spell): don't allow to tame an already owned creature (#9005)

src/server/scripts/Spells/spell_hunter.cpp

@@ -946,6 +946,12 @@ class spell_hun_tame_beast : public SpellScript
                 player->SendTameFailure(PET_TAME_ANOTHER_SUMMON_ACTIVE);
                 return SPELL_FAILED_DONT_REPORT;
             }
+
+            if (target->GetOwnerGUID())
+            {
+                player->SendTameFailure(PET_TAME_CREATURE_ALREADY_OWNED);
+                return SPELL_FAILED_DONT_REPORT;
+            }
         }
         else
         {