Fix getGroupMembers with token that don't have sufficient permissions

Signed-off-by: Boris Gershanik <borbor154@gmail.com>

plugins/catalog-backend-module-gitlab/src/lib/client.test.ts

@@ -429,6 +429,28 @@ describe('GitLabClient', () => {
       expect(members).toEqual([1]);
     });
 
+    it('gets member IDs with token without full permissions', async () => {
+      server.use(
+        graphql
+          .link(`${MOCK_CONFIG.baseUrl}/api/graphql`)
+          .operation((_, res, ctx) =>
+            res(
+              ctx.data({
+                group: {},
+              }),
+            ),
+          ),
+      );
+      const client = new GitLabClient({
+        config: MOCK_CONFIG,
+        logger: getVoidLogger(),
+      });
+
+      const members = await client.getGroupMembers('group1');
+
+      expect(members).toEqual([]);
+    });
+
     it('rejects when GraphQL returns errors', async () => {
       server.use(
         graphql

plugins/catalog-backend-module-gitlab/src/lib/client.ts

@@ -127,6 +127,14 @@ export class GitLabClient {
       if (response.errors) {
         throw new Error(`GraphQL errors: ${JSON.stringify(response.errors)}`);
       }
+
+      if (!response.data.group?.groupMembers?.nodes) {
+        this.logger.warn(
+          `Couldn't get members for group ${groupPath}. The provided token might not have sufficient permissions`,
+        );
+        continue;
+      }
+
       memberIds.push(
         ...response.data.group.groupMembers.nodes
           .filter(n => n.user)