[Bug 4135] New: XML logs are invalid if the log is empty

[mercurial-bugs at selenic.com]

http://bz.selenic.com/show_bug.cgi?id=4135

          Priority: normal
            Bug ID: 4135
                CC: mercurial-devel at selenic.com
          Assignee: bugzilla at selenic.com
           Summary: XML logs are invalid if the log is empty
          Severity: bug
    Classification: Unclassified
                OS: Linux
          Reporter: dg at cowlark.com
          Hardware: PC
            Status: UNCONFIRMED
           Version: 2.2.2
         Component: Mercurial
           Product: Mercurial

If you do 'hg log --style xml' on a repository with no checkins, you get no
output. I'd have expected to have received an XML header and an empty <log>
element.

Test case:

$ hg init
$ hg log --style xml

-> nothing

$ hg init
$ touch q
$ hg add q
$ hg commit -m "checkin"
$ hg log --style xml

->

<?xml version="1.0"?>
<log>
<logentry revision="0" node="4bcfe6b79ecdaa73f9071027959541f429f82fd6">
<tag>tip</tag>
<author email="dg at cowlark.com">David Given</author>
<date>2013-12-20T14:39:09+00:00</date>
<msg xml:space="preserve">checkin</msg>
</logentry>
</log>

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