[pango] coretext: guard for unset language

[Kristian Rietveld <kristian src gnome org>]

commit ea326fdf0d2c12ef0d4c58882b795caa3f0050bc
Author: Kristian Rietveld <kris loopnest org>
Date:   Fri May 29 21:33:21 2015 +0200

    coretext: guard for unset language
    
    Fixes bug #750017

 pango/pangocoretext-fontmap.c |   28 ++++++++++++++++++----------
 1 files changed, 18 insertions(+), 10 deletions(-)
---
diff --git a/pango/pangocoretext-fontmap.c b/pango/pangocoretext-fontmap.c
index 1b64f62..27132c4 100644
--- a/pango/pangocoretext-fontmap.c
+++ b/pango/pangocoretext-fontmap.c
@@ -1593,19 +1593,27 @@ pango_core_text_fontset_new (PangoCoreTextFontsetKey    *key,
   /* Add the cascade list for this language */
 #if defined(MAC_OS_X_VERSION_10_8) && MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_8
     {
-      CFArrayRef language_pref_list;
+      CFArrayRef language_pref_list = NULL;
       CFStringRef languages[1];
 
-      languages[0] = CFStringCreateWithCString (NULL,
-                                                pango_language_to_string (key->language),
-                                                kCFStringEncodingASCII);
-      language_pref_list = CFArrayCreate (kCFAllocatorDefault,
-                                          (const void **) languages,
-                                          1,
-                                          &kCFTypeArrayCallBacks);
+      if (key->language)
+        {
+          languages[0] = CFStringCreateWithCString (NULL,
+                                                    pango_language_to_string (key->language),
+                                                    kCFStringEncodingASCII);
+          language_pref_list = CFArrayCreate (kCFAllocatorDefault,
+                                              (const void **) languages,
+                                              1,
+                                              &kCFTypeArrayCallBacks);
+        }
+
       fontset->cascade_list = CTFontCopyDefaultCascadeListForLanguages (pango_core_text_font_get_ctfont 
(best_font), language_pref_list);
-      CFRelease (languages[0]);
-      CFRelease (language_pref_list);
+
+      if (language_pref_list)
+        {
+          CFRelease (languages[0]);
+          CFRelease (language_pref_list);
+        }
     }
 #else
   /* There is unfortunately no public API to retrieve the cascade list