[gthumb] catalogs: ignore errors when trying to load a library

[Paolo Bacchilega <paobac src gnome org>]

commit d411afc2694704677d4bdf46d65b1a5e82e3c938
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sat Apr 20 18:29:16 2019 +0200

    catalogs: ignore errors when trying to load a library

 extensions/catalogs/gth-file-source-catalogs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/extensions/catalogs/gth-file-source-catalogs.c b/extensions/catalogs/gth-file-source-catalogs.c
index 8dcae0b5..ca622e85 100644
--- a/extensions/catalogs/gth-file-source-catalogs.c
+++ b/extensions/catalogs/gth-file-source-catalogs.c
@@ -1320,7 +1320,7 @@ static void
 remove_from_catalog_end (GError                *error,
                         RemoveFromCatalogData *data)
 {
-       if (error != NULL)
+       if ((data->catalog != NULL) && (error != NULL))
                _gtk_error_dialog_from_gerror_show (data->parent, _("Could not remove the files from the 
catalog"), error);
 
        _g_object_unref (data->catalog);