Allow the change of a column color back to 'transparent' (as in the default setting)

[MiriamLeischner]

In the default setting the color of a column in a table is set to transparant. After changing the color it is impossible to change back to transparent because the setting is not available. Only a workaround with a measure or changing all column colors back to transparent is possible. A standard feature to have a transparent column color would be very helpful.