marker-high-levels and marker-low-levels may not exist in printer attributes returned by CUPS, so we'll use .get() to avoid this and default to None: KeyError: 'marker-high-levels' Fixes #27518
marker-high-levels and marker-low-levels may not exist in printer attributes returned by CUPS, so we'll use .get() to avoid this and default to None: KeyError: 'marker-high-levels' Fixes #27518