fix(driver): allow undefined extensions key in Magento graphql responses (#3087)

In Magento versions that support GraphQl prior to v2.4.6 there was a key errors
called "extensions" that contained an error code indicating what kind of error you received.
For whatever reason, in v2.4.6 they removed this.

Once you upgrade to v2.4.6, without this patch you will see errors like `Cannot read properties of undefined (reading 'category')` as a result.

Author: damienwebdev

libs/driver/magento/src/errors/transform-graphql.spec.ts

@@ -1,5 +1,3 @@
-import { ApolloError } from '@apollo/client/core';
-
 import {
   DaffError,
   DaffErrorCodeMap,
@@ -60,6 +58,12 @@ describe('@daffodil/driver/magento | daffMagentoTransformGraphQlError', () => {
   });
 
   it('should not crash if the extension is not defined', () => {
+    const { extensions, ...error } = unhandledGraphQlError;
+    expect(() => daffMagentoTransformGraphQlError(error, map)).not.toThrow();
+    expect(daffMagentoTransformGraphQlError(error, map)).toEqual(new DaffDriverMagentoError('An error we don\'t handle'));
+  });
+
+  it('should not crash if there are no extensions defined', () => {
     const error = { ...unhandledGraphQlError, extensions: {}};
     expect(() => daffMagentoTransformGraphQlError(error, map)).not.toThrow();
   });

libs/driver/magento/src/errors/transform-graphql.ts

@@ -11,7 +11,7 @@ export function daffMagentoTransformGraphQlError<T extends DaffErrorCodeMap>(
   error: GraphQLError,
   map: T,
 ): DaffError {
-  const ErrorClass = map[error.extensions.category] || DaffDriverMagentoError;
+  const ErrorClass = map[error?.extensions?.category] || DaffDriverMagentoError;
 
   return new ErrorClass(error.message) ;
 };