[Shotwell] More info on segfault

[Kirk Bressler]

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_path: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_parent: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_path: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_new_for_path: assertion `path
!= NULL' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_basename: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_child: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-GIO-CRITICAL **: g_file_get_path: assertion
`G_IS_FILE (file)' failed

(shotwell:6826): GLib-CRITICAL **: g_utf8_collate: assertion `str1 != NULL'
failed


ETC......