[CBRD-24422] When an error occurs in update_class(), it is not initia…

…lized to NULL after classobj_free_template() is executed, so core occurs later. (#3711) (#3862)

http://jira.cubrid.org/browse/CBRD-24422

backport #3711

src/object/schema_manager.c

@@ -12762,6 +12762,13 @@ update_class (SM_TEMPLATE * template_, MOP * classmop, int auto_res)
   assert (error != ER_HEAP_NODATA_NEWADDRESS);	/* TODO - */
 
   classobj_free_template (flat);
+
+  /* don't touch this class if we aborted ! */
+  if (class_ != NULL && error != ER_LK_UNILATERALLY_ABORTED)
+    {
+      class_->new_ = NULL;
+    }
+
   abort_subclasses (newsubs);
   if (error == ER_BTREE_UNIQUE_FAILED || error == ER_FK_INVALID || error == ER_SM_PRIMARY_KEY_EXISTS
       || error == ER_NOT_NULL_DOES_NOT_ALLOW_NULL_VALUE || error == ER_SM_INVALID_UNIQUE_IDX_PARTITION)