fab1cc4 don't fail if child task doesn't provide source

Authored and Committed by mikem 2 years ago
    don't fail if child task doesn't provide source
    
    While the current code will always provide it, the older code did
    not. When a Koji system is updated to this version, we could have
    a restarted build task read the result of a previously finished
    buildSRPMFromSCM task that ran with the old code.
    
        
file modified
+4 -1