Allow get_table() to return NULL

src/hb-font.cc

@@ -324,10 +324,14 @@ hb_blob_t *
 hb_face_get_table (hb_face_t *face,
 		   hb_tag_t   tag)
 {
+  hb_blob_t *blob;
+
   if (HB_UNLIKELY (!face || !face->get_table))
     return hb_blob_create_empty ();
 
-  return face->get_table (tag, face->user_data);
+  blob = face->get_table (tag, face->user_data);
+
+  return blob? blob : hb_blob_create_empty ();
 }
 
 

src/hb-ft.c

@@ -159,7 +159,7 @@ _get_table  (hb_tag_t tag, void *user_data)
   /* TODO Use FT_Memory? */
   buffer = malloc (length);
   if (buffer == NULL)
-    return hb_blob_create_empty ();
+    return NULL;
 
   error = FT_Load_Sfnt_Table (ft_face, tag, 0, buffer, &length);
   if (error)