BzrDir.has_{branch,workingtree}

[Jelmer Vernooij]

BzrDir has two methods that just check whether a branch or working tree
are present. Their docstrings already mention that using them is
probably a bad idea - if you need a Branch you should just try to open
it and deal with any exceptions that occur, rather than checking first
if the branch is present.

There are only two users of has_branch() in the Bazaar codebase, but
they could easily be removed. Does anybody object to it being removed?

Cheers,

Jelmer
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