context: stop catching TypeError when converting hex nodeid to binary
It has been a programming error to pass a 40-character string that is
not a hex nodeid since
8b86acc7aa64 (context: drop support for looking
up context by ambiguous changeid (API), 2018-04-28), so we can just
let it raise a TypeError.
Differential Revision: https://phab.mercurial-scm.org/D4807
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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