editing non-existent profile causes traceback

[jmrodri]

if we try to "rho profile edit" a profile that doesnt exist:
Traceback (most recent call last):
File "/home/adrian/src/rho/bin/rho", line 22, in
CLI().main()
File "/home/adrian/src/rho/src/rho/cli.py", line 95, in main
cmd.main()
File "/home/adrian/src/rho/src/rho/clicommands.py", line 136, in main
self._do_command()
File "/home/adrian/src/rho/src/rho/clicommands.py", line 461, in _do_command
g.ranges = self.options.ranges
AttributeError: 'NoneType' object has no attribute 'ranges'