[ocrfeeder] Fix getting selected scanner from scan dialog

[Joaquim Rocha <jrocha src gnome org>]

commit eafa8f61443bb76318efdad5b9963de227924082
Author: scx <scx mail gmail com>
Date:   Mon Jan 6 19:54:35 2020 +0100

    Fix getting selected scanner from scan dialog
    
    The code that gets the selected scanner was being called after the
    dialog destroyed, and that resulted in always getting "None" as the
    selected scanner.
    
    This patch fixes that by simply calling the mentioned function before
    destroying the dialog.

 src/ocrfeeder/studio/studioBuilder.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/ocrfeeder/studio/studioBuilder.py b/src/ocrfeeder/studio/studioBuilder.py
index cbf4490..f713c7c 100644
--- a/src/ocrfeeder/studio/studioBuilder.py
+++ b/src/ocrfeeder/studio/studioBuilder.py
@@ -200,10 +200,10 @@ class Studio:
             Gdk.threads_enter()
             response = scanner_chooser_dialog.run()
             Gdk.threads_leave()
-            scanner_chooser_dialog.destroy()
             if response == Gtk.ResponseType.ACCEPT:
                 device = scanner_chooser_dialog.getSelectedDevice()
-            else:
+            scanner_chooser_dialog.destroy()
+            if response != Gtk.ResponseType.ACCEPT:
                 return
         elif len(devices) == 1:
             device = devices[0][0]