libsaria: Only shutdown server when server exists

I now always call the shutdown() function to close the server.  This
function checks if the server pointer has been set, and if it has it
calls the server's shutdown() function.

libsaria/__init__.py

@@ -26,8 +26,7 @@ def startup():
 
 def shutdown():
 	audio.shutdown()
-	if version.__dev__ == True:
-		server.shutdown()
+	server.shutdown()
 ##	import plugin
 ##	plugin.quit()
 

libsaria/server/__init__.py

@@ -14,4 +14,5 @@ def setup_server():
 threading.Thread(target=setup_server).start()
 
 def shutdown():
-	server.shutdown()
+	if server != None:
+		server.shutdown()