Simply display zero if it's less or equals to 0.
{
public:
    
    void writeProgress();
    void writeFinalProgress();
    
    void clearProgressOutput();
    
    void resetProgress();
    
    
    
    
    
    
    bool updateProgress(const Progress & value);
    
    
    
    void setFileProgressCallback(ContextMutablePtr context, bool write_progress_on_update = false);
    
    double elapsedSeconds() const { return watch.elapsedSeconds(); }