Added qDebug()-logging database connection error text.
Added qDebug()-logging database connection error text.

nomovok-opensource/cutedriver-visualizer,ration/tdriver_visualizer,ration/tdriver_visualizer,nomovok-opensource/cutedriver-visualizer,nomovok-opensource/cutedriver-visualizer,nomovok-opensource/cutedriver-visualizer,ration/tdriver_visualizer,ration/tdriver_visualizer,ration/tdriver_visualizer