added gh verification error message (#3808)

* added error message

* undo linter breaking change

* better error handling

Author: MasterHW

packages/builder/src/components/providers/identity/credentials.ts

@@ -96,6 +96,12 @@ export const fetchVerifiableCredential = async (
     throw new VerificationError("No credential found");
   }
 
+  if (response.data[0].credential.issuer.length === 0) {
+    throw new VerificationError(
+      "Error verifying ownership - ensure you are a public member of the org"
+    );
+  }
+
   // return everything that was used to create the credential (along with the credential)
   return {
     signature,