remove

Removes media art for given album/artist provided.

If artist and album are null, ALL media art cache is removed.

All string inputs must be valid UTF8. Use validate if the input has not already been validated.

Parameters:

artist	artist the media art belongs to
album	album the media art belongs or null
cancellable	optional Cancellable object, null to ignore.

Returns:

TRUE on success, otherwise FALSE where throws will be set.