[gimp/metadata-browser] app: don't g_assert_not_reached on GIMP_PDB_FAILED errors

[Roman Joost <romanofski src gnome org>]

commit aa85f23dde8c2569c8c40182574e9b3fd3a1c065
Author: Massimo Valentini <mvalentini src gnome org>
Date:   Mon Mar 5 18:36:03 2012 +0100

    app: don't g_assert_not_reached on GIMP_PDB_FAILED errors
    
    calling in a script (gimp-file-load-layer 1 image "notexists.bmp")
    used to crash GIMP with the following message:
    
    **
    Gimp-PDB:ERROR:gimpprocedure.c:491:gimp_procedure_get_return_values:
    code should not be reached
    gimp-2.7: terminated: Aborted

 app/pdb/gimpprocedure.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/app/pdb/gimpprocedure.c b/app/pdb/gimpprocedure.c
index adb1438..83a9cee 100644
--- a/app/pdb/gimpprocedure.c
+++ b/app/pdb/gimpprocedure.c
@@ -476,6 +476,7 @@ gimp_procedure_get_return_values (GimpProcedure *procedure,
         {
           switch ((GimpPdbErrorCode) error->code)
             {
+            case GIMP_PDB_FAILED:
             case GIMP_PDB_PROCEDURE_NOT_FOUND:
             case GIMP_PDB_INVALID_ARGUMENT:
             case GIMP_PDB_INVALID_RETURN_VALUE: