outgoing: adds some default value for argument
We are about to introduce a third option to create an outgoing object:
'missingroots'. This argument will be mutually exclusive with 'commonheads' so
we implement some default value handling in preparation.
This will also help use to make more use of outgoing creation around the code
base.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown