Fix ls migration failed when tablet deleted before fetch tablet info

src/share/ob_debug_sync_point.h

@@ -434,6 +434,7 @@ class ObString;
     ACT(MODIFY_HIDDEN_TABLE_NOT_NULL_COLUMN_STATE_BEFORE_PUBLISH_SCHEMA,)\
     ACT(AFTER_MIGRATION_FETCH_TABLET_INFO,)\
     ACT(BEFORE_SET_LS_MEMBER_LIST,)\
+    ACT(BEFORE_MIGRATION_FETCH_TABLET_INFO,)\
     ACT(MAX_DEBUG_SYNC_POINT,)
 
 DECLARE_ENUM(ObDebugSyncPoint, debug_sync_point, OB_DEBUG_SYNC_POINT_DEF);