abb2e08 critpath: make config value optional

Authored and Committed by kparal 5 years ago
    critpath: make config value optional
    
    This allows administrators to disable critpath checking by simply not
    pointing trigger to any critpath file (the default behavior after this
    patch). The job triggers will receive an empty critpath list set in this
    case. If a critpath file is set in the config file, the file has to
    exist and be valid.
    
    This improves reliability over the previous change in e67e56745ac.
    
    Fixes #54
    Merges #56
    
        
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