[gthumb] [flicker importer] fixed crash the the image url is not found

[Paolo Bacchilega <paobac src gnome org>]

commit 69f6b8c3dde129fe8b2157bab02f8bd0719e1f0e
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Wed Aug 4 22:34:25 2010 +0200

    [flicker importer] fixed crash the the image url is not found
    
    when loading the image preview give priority to the smallest
    thumbnail, then try the other sizes from the smallest to the
    biggest, if still no preview is found try the squared thumbnail.

 extensions/flicker/dlg-import-from-flickr.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)
---
diff --git a/extensions/flicker/dlg-import-from-flickr.c b/extensions/flicker/dlg-import-from-flickr.c
index 4066800..0cfba5b 100644
--- a/extensions/flicker/dlg-import-from-flickr.c
+++ b/extensions/flicker/dlg-import-from-flickr.c
@@ -366,9 +366,24 @@ list_photos_ready_cb (GObject      *source_object,
 	list = NULL;
 	for (scan = data->photos; scan; scan = scan->next) {
 		FlickrPhoto *photo = scan->data;
+		const char  *url;
 		GthFileData *file_data;
 
-		file_data = gth_file_data_new_for_uri (photo->url_o, (photo->mime_type != NULL) ? photo->mime_type : "image/jpeg");
+		url = NULL;
+		if (photo->url_s != NULL)
+			url = photo->url_s;
+		else if (photo->url_m != NULL)
+			url = photo->url_m;
+		else if (photo->url_o != NULL)
+			url = photo->url_o;
+
+		if (url == NULL)
+			url = photo->url_sq;
+
+		if (url == NULL)
+			continue;
+
+		file_data = gth_file_data_new_for_uri (url, (photo->mime_type != NULL) ? photo->mime_type : "image/jpeg");
 		g_file_info_set_file_type (file_data->info, G_FILE_TYPE_REGULAR);
 		g_file_info_set_size (file_data->info, FAKE_SIZE); /* set a fake size to make the progress dialog work correctly */
 		g_file_info_set_attribute_object (file_data->info, "flickr::object", G_OBJECT (photo));