Core/SpellScripts: Added helper method to validate spells

(cherry picked from commit 2b5d7eef3a091e67c27e853d43ac0bebbfa67531)

src/server/game/Spells/SpellScript.cpp

@@ -18,6 +18,7 @@
 #include "Spell.h"
 #include "ScriptMgr.h"
 #include "SpellAuras.h"
+#include "SpellMgr.h"
 #include "SpellScript.h"
 #include "SpellMgr.h"
 #include <string>
@@ -32,6 +33,17 @@ bool _SpellScript::_Validate(SpellInfo const* entry)
     return true;
 }
 
+bool _SpellScript::ValidateSpellInfo(std::vector<uint32> spellIds)
+{
+    for (uint32 spellId : spellIds)
+        if (!sSpellMgr->GetSpellInfo(spellId))
+        {
+            TC_LOG_ERROR("scripts.spells", "_SpellScript::ValidateSpellInfo: Spell %u does not exist.", spellId);
+            return false;
+        }
+    return true;
+}
+
 void _SpellScript::_Register()
 {
     m_currentScriptState = SPELL_SCRIPT_STATE_REGISTRATION;