message: Ignore if resolver undefined
diff: @@ -338,6 +338,7 @@ export class GraphQLModule<Config = any, Request = any, Context = any> {
  // tslint:disable-next-line:forin
  for (const prop in resolvers[type]) {
  const resolver = typeResolvers[prop];
  + if (resolver) {
  const dependencies = resolver['dependencies'];
  if (dependencies) {
  const injections = dependencies.map((dependency: any) => injector.get(dependency));
  @@ -345,6 +346,7 @@ export class GraphQLModule<Config = any, Request = any, Context = any> {
  }
  }
  }
  + }
  const resolversHandlers = this.selfResolversHandlers;
  