[epiphany] Fix a crash when deciding whether to switch to overview mode

[Carlos Garcia Campos <carlosgc src gnome org>]

commit 892b1d2649776dac118622a59cf827c7f1b51811
Author: Carlos Garcia Campos <cgarcia igalia com>
Date:   Wed Feb 20 18:02:26 2013 +0100

    Fix a crash when deciding whether to switch to overview mode
    
    It seems that URI might be NULL in some cases.

 embed/ephy-embed.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/embed/ephy-embed.c b/embed/ephy-embed.c
index a465a14..eef9106 100644
--- a/embed/ephy-embed.c
+++ b/embed/ephy-embed.c
@@ -303,7 +303,7 @@ load_changed_cb (WebKitWebView *web_view,
     const char *uri;
 
     uri = webkit_web_view_get_uri (web_view);
-    ephy_embed_set_overview_mode (embed, strcmp (uri, "ephy-about:overview") == 0);
+    ephy_embed_set_overview_mode (embed, uri && strcmp (uri, "ephy-about:overview") == 0);
     break;
   }
   case WEBKIT_LOAD_COMMITTED: