[PATCH][BUG] BZR_PLUGIN_PATH='' loads from ~/.bzr.conf/plugins

[Roncaglia Julien]

Martin Pool said the following :
> I vaguely recall something about Windows being unable to distinguish
> empty and unset environment variables.  Is that true?

>From GetEnvironmentVariable in MSDN :

If the function fails, the return value is zero. If the specified
environment variable was not found in the environment block,
GetLastError returns ERROR_ENVVAR_NOT_FOUND.
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