AttributeError when clicking on QLabel (map area) if no data loaded
clicking on Qlabel/map area when no data has been loaded yet triggers clear_profile_line() which raises an AttributeError ('myQLabel' object has no attribute 'current_pixmap').
clicking on Qlabel/map area when no data has been loaded yet triggers clear_profile_line() which raises an AttributeError ('myQLabel' object has no attribute 'current_pixmap').