Core/AI: Fix assertion triggered with PetAI derived scripts (#21254)

* Core/AI: Fix assertion triggered with PetAI derived scripts

Fix an assertion triggered when spawning through ".npc add" or from SQL db table a Creature with AI set to a custom AI inheriting from PetAI.

(cherry picked from commit 95a76a83fcbad0e52c6013697544e3c5691e7e24)

1 files changed, 23 insertions, 0 deletions

diff --git a/src/server/game/AI/AIException.cpp b/src/server/game/AI/AIException.cpp
new file mode 100644
index 00000000000..3af2deda12c
--- /dev/null
+++ b/src/server/game/AI/AIException.cpp
@@ -0,0 +1,23 @@
+/*
+ * This file is part of the TrinityCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "AIException.h"
+
+InvalidAIException::InvalidAIException(char const* _message)
+{
+    message().assign(_message);
+}