[bundler/bundler] Fix `bundle doctor` command

Previously `bundle doctor` would fail on any bundle that does not
include git gems or plugins. This is because the previously used
`Bundler.home` does not exist unless the bundle includes git gems or
plugins. For example, with `bundle config set path .bundle`, it points
to which does not exist unless this kind of gems exist in the Gemfile.

The name `Bundler.home` is really unfortunate, it should probably be
have more descriptive name, and be private. But for now I just want to
make `bundle doctor` usable.

https://github.com/bundler/bundler/commit/5531a18c1e

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