[recipes] shopping page: Be safe against NULL units

[Matthias Clasen <matthiasc src gnome org>]

commit ac63763a43223e34f9d432cb4e49d99a08cfc782
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 14 14:46:01 2017 -0500

    shopping page: Be safe against NULL units
    
    Which happens, e.g. for "6 Eggs".

 src/gr-shopping-page.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/src/gr-shopping-page.c b/src/gr-shopping-page.c
index c105601..c1caae6 100644
--- a/src/gr-shopping-page.c
+++ b/src/gr-shopping-page.c
@@ -191,7 +191,7 @@ ingredient_add (Ingredient *ing,
         for (i = 0; i < ing->units->len; i++) {
                 Unit *u = &g_array_index (ing->units, Unit, i);
 
-                if (strcmp (u->unit, unit) == 0) {
+                if (g_strcmp0 (u->unit, unit) == 0) {
                         gr_number_add (&u->amount, amount, &u->amount);
                         return;
                 }
@@ -219,7 +219,8 @@ ingredient_format_unit (Ingredient *ing)
                 num = gr_number_format (&(u->amount));
                 g_string_append (s, num);
                 g_string_append (s, " ");
-                g_string_append (s, u->unit);
+                if (u->unit)
+                        g_string_append (s, u->unit);
         }
 
         return g_strdup (s->str);