[gthumb] catalogs: do not try to set the metadata if an error occurs

[Paolo Bacchilega <paobac src gnome org>]

commit adb786ab3680374478b1580b48690166d8f1e52a
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Mon Jan 27 10:15:20 2020 +0100

    catalogs: do not try to set the metadata if an error occurs
    
    In that case the catalog is NULL.

 extensions/catalogs/gth-file-source-catalogs.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/extensions/catalogs/gth-file-source-catalogs.c b/extensions/catalogs/gth-file-source-catalogs.c
index 02dc2147..86d38f6a 100644
--- a/extensions/catalogs/gth-file-source-catalogs.c
+++ b/extensions/catalogs/gth-file-source-catalogs.c
@@ -345,12 +345,15 @@ read_metadata_catalog_ready_cb (GObject  *object,
 {
        ReadMetadataOpData *read_metadata = user_data;
 
-       /* ignore errors */
-       if (error != NULL)
+       if (error != NULL) {
+               /* ignore errors */
                g_clear_error (&error);
-
-       gth_catalog_update_metadata (GTH_CATALOG (object), read_metadata->file_data);
-       g_object_unref (object);
+       }
+       else {
+               g_assert (object != NULL);
+               gth_catalog_update_metadata (GTH_CATALOG (object), read_metadata->file_data);
+               g_object_unref (object);
+       }
 
        read_metadata->callback (G_OBJECT (read_metadata->file_source), error, read_metadata->data);
        read_metadata_free (read_metadata);