[recipes] Handle empty search terms without crashing

[Matthias Clasen <matthiasc src gnome org>]

commit c660e436b9ae452eee5e7e1f251a4ab87cbd80e4
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jan 1 10:22:34 2017 -0500

    Handle empty search terms without crashing
    
    Now that search terms are an array, we need to treat the
    empty array like a NULL string.

 src/gr-recipe-store.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gr-recipe-store.c b/src/gr-recipe-store.c
index c092671..0a2bc90 100644
--- a/src/gr-recipe-store.c
+++ b/src/gr-recipe-store.c
@@ -1646,7 +1646,7 @@ gr_recipe_search_set_terms (GrRecipeSearch  *search,
 {
         gboolean narrowing;
 
-        if (terms == NULL) {
+        if (terms == NULL || terms[0] == NULL) {
                 stop_search (search);
                 g_clear_pointer (&search->query, g_strfreev);
                 return;