[yelp/carlosgc/webkit2-port] libyelp: fix runtime critical warning at startup when loading info document

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 56de7ef0fa362e531afa65ace565d1654f2fdf52
Author: Carlos Garcia Campos <cgarcia igalia com>
Date:   Tue Jun 16 10:01:52 2015 +0200

    libyelp: fix runtime critical warning at startup when loading info document
    
    YelpURI doesn't set a page_id when resolving info URIs, but YelpDocument
    assumes it can't be NULL in document_request_page(). Simply check it's
    not NULL before trying to use g_str_has_prefix().

 libyelp/yelp-document.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/libyelp/yelp-document.c b/libyelp/yelp-document.c
index 0ee1219..c7c2f1f 100644
--- a/libyelp/yelp-document.c
+++ b/libyelp/yelp-document.c
@@ -857,7 +857,7 @@ document_request_page (YelpDocument         *document,
 
     g_mutex_lock (&document->priv->mutex);
 
-    if (g_str_has_prefix (page_id, "search=")) {
+    if (page_id && g_str_has_prefix (page_id, "search=")) {
         document->priv->reqs_search = g_slist_prepend (document->priv->reqs_search, request);
         if (document->priv->indexed)
             g_idle_add ((GSourceFunc) document_indexed, document);