[rhythmbox] source-header: don't sync source state if there's no source (bug #607935)

[Jonathan Matthew <jmatthew src gnome org>]

commit c884a26c901274c04400760354bd2e8fd94c3f83
Author: Jonathan Matthew <jonathan d14n org>
Date:   Mon Feb 22 22:06:00 2010 +1000

    source-header: don't sync source state if there's no source (bug #607935)
    
    When there's no selected source (such as when visualization is active),
    it doesn't make any sense to sync the header with the source's state.

 shell/rb-source-header.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/shell/rb-source-header.c b/shell/rb-source-header.c
index 7f5fa01..53fafa0 100644
--- a/shell/rb-source-header.c
+++ b/shell/rb-source-header.c
@@ -677,6 +677,10 @@ rb_source_state_sync (RBSourceHeader *header,
 	gboolean do_search = FALSE;
 	char *old_text = NULL;
 
+	if (header->priv->selected_source == NULL) {
+		return;
+	}
+
 	state = g_hash_table_lookup (header->priv->source_states,
 				     header->priv->selected_source);
 	if (state == NULL) {