Core: define CREATURE_FAMILY_NONE to avoid magic numbers in code

src/server/scripts/Commands/cs_pet.cpp

@@ -69,10 +69,10 @@ public:
         }
 
         CreatureTemplate const* creatureTemplate = creatureTarget->GetCreatureTemplate();
-        // Creatures with family 0 crashes the server
+        // Creatures with family CREATURE_FAMILY_NONE crashes the server
         if (!creatureTemplate->family)
         {
-            handler->PSendSysMessage("This creature cannot be tamed. (family id: 0).");
+            handler->PSendSysMessage("This creature cannot be tamed. (family id: CREATURE_FAMILY_NONE).");
             handler->SetSentErrorMessage(true);
             return false;
         }

src/server/scripts/Spells/spell_warlock.cpp

@@ -508,6 +508,8 @@ class spell_warl_demonic_empowerment : public SpellScriptLoader
                             case CREATURE_FAMILY_IMP:
                                 targetCreature->CastSpell(targetCreature, SPELL_WARLOCK_DEMONIC_EMPOWERMENT_IMP, true);
                                 break;
+                            default:
+                                break;
                         }
                     }
                 }