88b1aeb Adapted to nil arg in rpm 4.17

Authored and Committed by jvanek 2 years ago
    Adapted to nil arg in rpm 4.17
    
    Moved main body to special function mainProgram. If the arg are present,
    then the mainProgram is called as usually (so it should be backward
    comaptible with previous scriptlets) if arg is not present, then nothing
    happens. User of arg-less environemnt, have to call mainProgram manually
    
        
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