Ignore EPIPE in pipefilter
This hides the following traceback (there's a race condition involved,
so you may have to try a few times to hit it):
$ hg sign --key key-that-does-not-exist
Signing 2062:4bad92f4ea65
gpg: skipped "key-that-does-not-exist": secret key not available
gpg: signing failed: secret key not available
Exception in thread Thread-1:
Traceback (most recent call last):
File "threading.py", line 442, in __bootstrap
self.run()
File "threading.py", line 422, in run
self.__target(*self.__args, **self.__kwargs)
File "mercurial/util.py", line 24, in writer
pin.close()
IOError: [Errno 32] Broken pipe
abort: Error while signing
<table class="parity#parity#" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td align="right" width="15%"><b>#date|age# ago: </b></td>
<td><b><a href="?cs=#node|short#">#desc|strip|firstline|escape#</a></b></td></tr>
<tr>
<td align="right">revision #filerev#: </td>
<td><a href="?f=#filenode|short#;file=#file|urlescape#">#filenode|short#</a>
<a href="?fd=#node|short#;file=#file|urlescape#">(diff)</a>
<a href="?fa=#filenode|short#;file=#file|urlescape#">(annotate)</a>
</td></tr>
#rename%filelogrename#
<tr>
<td align="right">author: </td>
<td>#author|obfuscate#</td></tr>
<tr>
<td align="right">date: </td>
<td>#date|date# (#date|age# ago)</td></tr>
</table>