[gdm] greeter: don't call render_frame if there's no frame

[Ray Strode <halfline src gnome org>]

commit 6bb88258c9ce7c9b2a0477c697d64e2a36f42dfd
Author: Ray Strode <rstrode redhat com>
Date:   Fri Feb 4 15:06:11 2011 -0500

    greeter: don't call render_frame if there's no frame
    
    If the theme lacks a frame gtk_render_frame will throw
    a fit and make the greeter nose dive.

 gui/simple-greeter/gdm-scrollable-widget.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/gui/simple-greeter/gdm-scrollable-widget.c b/gui/simple-greeter/gdm-scrollable-widget.c
index 8a9ea25..1f8e807 100644
--- a/gui/simple-greeter/gdm-scrollable-widget.c
+++ b/gui/simple-greeter/gdm-scrollable-widget.c
@@ -598,8 +598,10 @@ gdm_scrollable_widget_draw (GtkWidget *widget,
         height = widget_allocation.height;
         height -= padding.top + padding.bottom;
 
-        gtk_render_frame (context, cr,
-                          x, y, width, height);
+        if (width > 0 && height > 0) {
+                gtk_render_frame (context, cr,
+                                  x, y, width, height);
+        }
 
         return GTK_WIDGET_CLASS (gdm_scrollable_widget_parent_class)->draw (widget, cr);
 }