Bug 27793

$ hg-fast-export -r https://code.google.com/p/google-docs-fs/
warning: code.google.com certificate with fingerprint 9f:af:b9:ce:b5:10:97:c0:5d:16:90:11:63:78:fa:2f:37:f4:96:79 not verified (check hostfingerprints or web.cacerts config setting)
Traceback (most recent call last):
  File "/usr/bin/hg-fast-export.py", line 390, in <module>
    options.statusfile,authors=a,sob=options.sob,force=options.force))
  File "/usr/bin/hg-fast-export.py", line 303, in hg2git
    if not verify_heads(ui,repo,heads_cache,force):
  File "/usr/bin/hg-fast-export.py", line 267, in verify_heads
    branches=repo.branchtags()
AttributeError: 'httpsrepository' object has no attribute 'branchtags'
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