import: Improve messages on empty camera
Tell the user that the camera is considered empty instead of stating "Starting import" forever. Also, improve wording on no files to import because "hide already imported" is active and no new files are available Signed-off-by: Jens Georg <mail@jensge.org> https://bugzilla.gnome.org/show_bug.cgi?id=718796
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901d0440