[gnome-builder] completion: handle null needles

[Christian Hergert <chergert src gnome org>]

commit ec3bad5c67080c63f7a709cf0a44b4412ca8be65
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jun 13 18:04:20 2018 -0700

    completion: handle null needles
    
    We used to add checks everywhere for this, but it's easier if we just
    give ourselves some protection against str*() functions dereferencing.

 src/libide/completion/ide-completion.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/src/libide/completion/ide-completion.c b/src/libide/completion/ide-completion.c
index 4bcc525cb..8ac589185 100644
--- a/src/libide/completion/ide-completion.c
+++ b/src/libide/completion/ide-completion.c
@@ -1629,7 +1629,7 @@ _ide_completion_set_font_description (IdeCompletion              *self,
 
 /**
  * ide_completion_fuzzy_match:
- * @haystack: the string to be searched.
+ * @haystack: (nullable): the string to be searched.
  * @casefold_needle: A g_utf8_casefold() version of the needle.
  * @priority: (out) (allow-none): An optional location for the score of the match
  *
@@ -1651,6 +1651,9 @@ ide_completion_fuzzy_match (const gchar *haystack,
 {
   gint real_score = 0;
 
+  if (haystack == NULL || haystack[0] == 0)
+    return FALSE;
+
   for (; *casefold_needle; casefold_needle = g_utf8_next_char (casefold_needle))
     {
       gunichar ch = g_utf8_get_char (casefold_needle);