[Bug 5988] New: Exception on searching for `wdir()`

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=5988

            Bug ID: 5988
           Summary: Exception on searching for `wdir()`
           Product: Mercurial
           Version: default branch
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: hgweb
          Assignee: bugzilla at mercurial-scm.org
          Reporter: zash at zash.se
                CC: mercurial-devel at mercurial-scm.org

Run `hg serve`
Enter into the hgweb search box "wdir()"

Observe traceback like this:

::1 - - [22/Sep/2018 17:13:32] Exception happened during processing request
'/log?rev=wdir%28%29':
Traceback (most recent call last):
  File "/home/zash/src/hg/mercurial/hgweb/server.py", line 102, in do_POST
    self.do_write()
  File "/home/zash/src/hg/mercurial/hgweb/server.py", line 95, in do_write
    self.do_hgweb()
  File "/home/zash/src/hg/mercurial/hgweb/server.py", line 187, in do_hgweb
    for chunk in self.server.application(env, self._start_response):
  File "/home/zash/src/hg/mercurial/hgweb/hgweb_mod.py", line 307, in run_wsgi
    for r in self._runwsgi(req, res, repo):
  File "/home/zash/src/hg/mercurial/hgweb/request.py", line 542, in
sendresponse
    for chunk in self._bodygen:
  File "/home/zash/src/hg/mercurial/util.py", line 1554, in increasingchunks
    for chunk in source:
  File "/home/zash/src/hg/mercurial/templateutil.py", line 695, in flatten
    for j in flatten(context, mapping, i):
  File "/home/zash/src/hg/mercurial/templateutil.py", line 685, in flatten
    for i in thing:
  File "/home/zash/src/hg/mercurial/templateutil.py", line 958, in joinitems
    for x in itemiter:
  File "/home/zash/src/hg/mercurial/templateutil.py", line 916, in _applymap
    for lm in _iteroverlaymaps(context, mapping, diter):
  File "/home/zash/src/hg/mercurial/templateutil.py", line 902, in
_iteroverlaymaps
    for i, nm in enumerate(newmappings):
  File "/home/zash/src/hg/mercurial/hgweb/webcommands.py", line 301, in
changelist
    lm = webutil.commonentry(web.repo, ctx)
  File "/home/zash/src/hg/mercurial/hgweb/webutil.py", line 426, in commonentry
    'node': hex(node),
TypeError: b2a_hex() argument 1 must be string or buffer, not None

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