Add code to catch backends incorrectly implementing the load vfunc.

	* libdocument/ev-document.c: (ev_document_load): Add code to catch
	backends incorrectly implementing the load vfunc.

svn path=/trunk/; revision=3460

1 files changed, 17 insertions, 2 deletions

diff --git a/libdocument/ev-document.c b/libdocument/ev-document.c
index 3356dc2..b230b70 100644
--- a/libdocument/ev-document.c
+++ b/libdocument/ev-document.c
@@ -120,8 +120,23 @@ ev_document_load (EvDocument  *document,
 {
 	EvDocumentIface *iface = EV_DOCUMENT_GET_IFACE (document);
 	gboolean retval;
-
-	retval = iface->load (document, uri, error);
+	GError *err = NULL;
+
+	retval = iface->load (document, uri, &err);
+	if (!retval) {
+		if (err) {
+			g_propagate_error (error, err);
+		} else {
+			g_warning ("%s::EvDocumentIface::load returned FALSE but did not fill in @error; fix the backend!\n",
+				   G_OBJECT_TYPE_NAME (document));
+
+			/* So upper layers don't crash */
+			g_set_error_literal (error,
+					     EV_DOCUMENT_ERROR,
+					     EV_DOCUMENT_ERROR_INVALID,
+					     "Internal error in backend");
+		}
+	}
 
 	return retval;
 }