So it seems there might be a couple of issues here. One is that you have some empty subclients which return the Job Pending Result: "No user found to backup" and others which return that some users failed to backup. Or are you seeing both returns on the same job?
In the CV logs you can differentiate between jobs by looking at the Job ID logged against the line you are checking.
From left to right the values are PID, Thread ID, Date, Time, Job ID, log information.
2232 12d8 05/11 20:07:00 123456 - "Some error or something"
If you open the log in GxTail (from the CV base directory) and then press F5, you can filter the log by Job ID.
In some agents there is an option to allow empty subclients to succeed, but this option doesn't exist for CloudApps it would seem.