[pitivi] medialibrary: fix import after choosing file from Recents

[Alexandru Băluț <alexbalut src gnome org>]

commit b23c67923487a13fba3c8a8b6c395b487b6e13af
Author: Rodolfo Ribeiro Gomes <rodolforg gmail com>
Date:   Sun Jul 16 15:16:34 2017 -0300

    medialibrary: fix import after choosing file from Recents
    
    If someone import a media using special panel 'Recents' (files) from file chooser dialog, it cannot 
import again due to exception raised by None value stored in last-import-folder
    
    Differential Revision: https://phabricator.freedesktop.org/D1783

 pitivi/medialibrary.py |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)
---
diff --git a/pitivi/medialibrary.py b/pitivi/medialibrary.py
index b2983b9..51f9d46 100644
--- a/pitivi/medialibrary.py
+++ b/pitivi/medialibrary.py
@@ -971,6 +971,9 @@ class MediaLibraryWidget(Gtk.Box, Loggable):
         self.debug("response: %r", response)
         if response == Gtk.ResponseType.OK:
             lastfolder = dialogbox.get_current_folder()
+            # get_current_folder() is None if file was chosen from 'Recents'
+            if not lastfolder:
+                lastfolder = GLib.path_get_dirname(dialogbox.get_filename())
             self.app.settings.lastImportFolder = lastfolder
             dialogbox.props.extra_widget.saveValues()
             filenames = dialogbox.get_uris()