[rhythmbox] fix segfault when showing all in non-source pages

[Jamie Nicol <jamien src gnome org>]

commit 955bb93753abb3c01e9dd97290459b70c5b3028d
Author: Jamie Nicol <jamie thenicols net>
Date:   Fri Dec 31 17:50:12 2010 +0000

    fix segfault when showing all in non-source pages

 shell/rb-shell.c |   12 +++++++-----
 1 files changed, 7 insertions(+), 5 deletions(-)
---
diff --git a/shell/rb-shell.c b/shell/rb-shell.c
index 660dc35..323efa9 100644
--- a/shell/rb-shell.c
+++ b/shell/rb-shell.c
@@ -2964,12 +2964,14 @@ static void
 rb_shell_cmd_view_all (GtkAction *action,
 		       RBShell *shell)
 {
-	RBSource *source = RB_SOURCE (shell->priv->selected_page);
-	rb_debug ("view all");
+	if (RB_IS_SOURCE (shell->priv->selected_page)) {
+		RBSource *source = RB_SOURCE (shell->priv->selected_page);
+		rb_debug ("view all");
 
-	rb_source_reset_filters (source);
-	rb_source_header_clear_search (shell->priv->source_header);
-	rb_source_header_focus_search_box (shell->priv->source_header);
+		rb_source_reset_filters (source);
+		rb_source_header_clear_search (shell->priv->source_header);
+		rb_source_header_focus_search_box (shell->priv->source_header);
+	}
 }
 
 static void