[gimp] plug-ins: don't set a NULL menu label in script_fu_script_install_proc()

[Michael Natterer <mitch src gnome org>]

commit 33c84ceb080bd54ffbb79add13da308d5a3693c7
Author: Michael Natterer <mitch gimp org>
Date:   Sun Sep 8 17:27:27 2019 +0200

    plug-ins: don't set a NULL menu label in script_fu_script_install_proc()

 plug-ins/script-fu/script-fu-script.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/plug-ins/script-fu/script-fu-script.c b/plug-ins/script-fu/script-fu-script.c
index 1872c295bf..d181f2ed7f 100644
--- a/plug-ins/script-fu/script-fu-script.c
+++ b/plug-ins/script-fu/script-fu-script.c
@@ -189,7 +189,8 @@ script_fu_script_install_proc (GimpPlugIn  *plug_in,
 
   gimp_procedure_set_image_types (procedure, script->image_types);
 
-  gimp_procedure_set_menu_label (procedure, menu_label);
+  if (menu_label)
+    gimp_procedure_set_menu_label (procedure, menu_label);
 
   gimp_procedure_set_documentation (procedure,
                                     script->blurb,