refactor: remove unnecesary assignment

Author: vkarpov15

lib/types/documentArray/methods/index.js

@@ -143,9 +143,7 @@ const methods = {
     if (idSchemaType) {
       try {
         castedId = idSchemaType.cast(id);
-      } catch (e) {
-        castedId = null;
-      }
+      } catch (_err) {}
     }
 
     let _id;