catch missing config

[mikemackintosh]

╭ ─[12:04:32]
╰ ─ splug@Splugs-MacMini { ~ } $ ctznosx manager register
[ Manager::Register ] Attempting to register device with remote server
Traceback (most recent call last):
File "/usr/local/bin/ctznosx", line 5, in
cli.main()
File "/Library/Python/2.7/site-packages/ctznosx/cli.py", line 103, in main
manager(argv)
File "/Library/Python/2.7/site-packages/ctznosx/cli.py", line 58, in manager
Manager.register_device()
File "/Library/Python/2.7/site-packages/ctznosx/devicemgmt.py", line 42, in register_device
code, resp = send_request("%s/connect/%s" % (CONFIG["reporting"]["target"], data["serial"]), data)
File "/Library/Python/2.7/site-packages/ctznosx/devicemgmt.py", line 66, in send_request
response = opener.open(request)
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 396, in open
protocol = req.get_type()
File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/urllib2.py", line 258, in get_type
raise ValueError, "unknown url type: %s" % self.original
ValueError: unknown url type: /connect/C0________