fix reporting of "no instances" found.
fix reporting of "no instances" found.

Change-Id: I5d316b7a46cf6b5d9fef36871abb8275a8551792
GitOrigin-RevId: 37f3f4030e0ce637b4b075512c0a543edd076cb3

GoogleCloudPlatform/gcpdiag,GoogleCloudPlatform/gcpdiag,GoogleCloudPlatform/gcpdiag