Fix internal error for py list --format url

[AA-Turner]

PS> py list -f url -vv
...
[ERROR] INTERNAL ERROR: KeyError: 'url'
# TRACEBACK:
Traceback (most recent call last):
  File "manage\__init__.py", line 50, in main
  File "manage\commands.py", line 665, in execute
  File "manage\list_command.py", line 300, in execute
  File "manage\list_command.py", line 192, in format_bare_url
KeyError: 'url'

A