[Checkins] [zopefoundation/ZODB] eac31d: repozo -B with missing -f should show a clear error

[Marius Gedminas]

  Branch: refs/heads/repozo-better-error
  Home:   https://github.com/zopefoundation/ZODB
  Commit: eac31d9fe07621e6a43aa08a187bf923908bb263
      https://github.com/zopefoundation/ZODB/commit/eac31d9fe07621e6a43aa08a187bf923908bb263
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-03-18 (Mon, 18 Mar 2019)

  Changed paths:
    M src/ZODB/scripts/repozo.py
    M src/ZODB/scripts/tests/test_repozo.py

  Log Message:
  -----------
  repozo -B with missing -f should show a clear error

Fixes #259.