Make 'deluge -u null' launch the null client.

deluge/ui/null/deluge_shell.py

@@ -219,6 +219,8 @@ commands = (('add', add_torrent, 'Add a torrent'),
 
 client.set_core_uri("http://localhost:58846")
 
+class NullUI:
+	def __init__(self, args):
 		print "Welcome to deluge-shell. Type 'help' to see a list of available commands."
 
 		readline.read_init_file()

deluge/ui/ui.py

@@ -59,4 +59,8 @@ class UI:
             log.info("Starting WebUI..")
             from deluge.ui.webui.webui import WebUI
             ui = WebUI(args)
+        elif selected_ui == "null":
+            log.info("Starting NullUI..")
+            from deluge.ui.null.deluge_shell import NullUI
+            ui = NullUI(args)