[gimp] libgimp: no need to set NULL strings on GimpPDBProcedure

[Michael Natterer <mitch src gnome org>]

commit 5a57256a24465d764700e9aeaa5a5fd8d66b37b7
Author: Michael Natterer <mitch gimp org>
Date:   Mon Sep 9 00:35:56 2019 +0200

    libgimp: no need to set NULL strings on GimpPDBProcedure

 libgimp/gimppdbprocedure.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)
---
diff --git a/libgimp/gimppdbprocedure.c b/libgimp/gimppdbprocedure.c
index 13bbdb051f..8b47ef8f50 100644
--- a/libgimp/gimppdbprocedure.c
+++ b/libgimp/gimppdbprocedure.c
@@ -230,12 +230,18 @@ _gimp_pdb_procedure_new (GimpPDB     *pdb,
       gint    i;
 
       string = _gimp_pdb_get_proc_image_types (name);
-      gimp_procedure_set_image_types (procedure, string);
-      g_free (string);
+      if (string)
+        {
+          gimp_procedure_set_image_types (procedure, string);
+          g_free (string);
+        }
 
       string = _gimp_pdb_get_proc_menu_label (name);
-      gimp_procedure_set_menu_label (procedure, string);
-      g_free (string);
+      if (string)
+        {
+          gimp_procedure_set_menu_label (procedure, string);
+          g_free (string);
+        }
 
       menu_paths = _gimp_pdb_get_proc_menu_paths (name, &n_menu_paths);
       for (i = 0; i < n_menu_paths; i++)