[recipes] Be more careful about handling NULL strings

[Matthias Clasen <matthiasc src gnome org>]

commit a147341ad26555eadd630475943851c7fa4c36ca
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 22 09:29:42 2017 -0500

    Be more careful about handling NULL strings
    
    Same for the GrChef object, just to be consistent.

 src/gr-chef.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/gr-chef.c b/src/gr-chef.c
index 0016b7a..8c2891b 100644
--- a/src/gr-chef.c
+++ b/src/gr-chef.c
@@ -135,10 +135,11 @@ gr_chef_set_property (GObject      *object,
                 break;
 
         case PROP_DESCRIPTION:
-                g_free (self->description);
+                g_clear_pointer (&self->description, g_free);
+                g_clear_pointer (&self->translated_description, g_free);
                 self->description = g_value_dup_string (value);
-                g_free (self->translated_description);
-                self->translated_description = translate_multiline_string (self->description);
+                if (self->description)
+                        self->translated_description = translate_multiline_string (self->description);
                 break;
 
         case PROP_IMAGE_PATH: