wal-e/wal-e — pull request #81 by fdr (2014-01-12 06:24:25+00:00)
Title: Inspect .errno only on EnvironmentError in WABS support

Previously, it would seem other exceptions would crash the program if
an errno was not present, and EnvironmentError typically is a parent
of exceptions that yield an errno.

@boldfield may want to review, as this is a wabs-only change.