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

[John A Meinel]

The problem is that it is not possible to set the environment variable,
such that no plugins are loaded. The problem is the code:

bzrpath = os.environ.get('BZR_PLUGIN_PATH')
if not bzrpath:
    bzrpath = DEFAULT

The problem is that "if not bzrpath" is true both when bzrpath is None,
and when it is the empty string.

Also, this probably should use osutils.config_dir() since that is the
central point where "~/.bzr.conf/" is defined. This also helps for the
possible future when the configure directory will change on Win32 (it
really should be in $APPDATA).

Anyway, the attached path fixes both issues.

John
=:->

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