bzr branch . has a confusing error message

[Wouter van Heyst]

Users coming from other systems, notably git, are not always familiar with the Bazaar design.
To discover what available branches there might be, such a user might try:

`bzr branch`
bzr: ERROR: command 'branch' requires argument FROM_LOCATION
(or nothing in old versions, need to check that)

Trying the next best thing:

`bzr branch .`
bzr: ERROR: Target directory "." already exists.

Very confusing.

[Wouter van Heyst (larstiq)]

Whereas `bzr branch path/to/.` will happily branch . to dirname(path/to/.)
Since there is a check for existing directories that prevents fun with `bzr branch subdir/..`, but if branch
ever got something like --use-existing-dir ala bug 30576, that check might be gone.

[Tim Hatch (timhatch)]

I observed this too... I had an empty directory and tried to branch to it.