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typing: add an assertion to mercurial/hgweb/webcommands.py to help pytype

Authored by mharbison72.

Description

typing: add an assertion to mercurial/hgweb/webcommands.py to help pytype

I have no idea why this is needed, given the check immediately above. But
without it, I'm getting this:

File "/mnt/c/Users/Matt/hg/mercurial/hgweb/webcommands.py", line 1164, in filelog: Missing parameter 'toline' in call to function mercurial.dagop.blockdescendants [missing-parameter]
         Expected: (fctx, fromline, toline)
  Actually passed: (fctx, fromline)
File "/mnt/c/Users/Matt/hg/mercurial/hgweb/webcommands.py", line 1166, in filelog: Missing parameter 'toline' in call to function mercurial.dagop.blockancestors [missing-parameter]
         Expected: (fctx, fromline, toline, followfirst)
  Actually passed: (fctx, fromline)

Differential Revision: https://phab.mercurial-scm.org/D10211