contrib/wix/dist.wxs

templatekw: clarify the result of {latesttag} when no tag exists

My initial expectation was that the list would be empty, and therefore
detectable with {if()}.  The map for {latesttag()} is populated with real values
in this case (except {tag}), so it probably doesn't make any sense to change
this to an empty list.

<?xml version="1.0" encoding="utf-8"?>
<Wix xmlns="http://schemas.microsoft.com/wix/2006/wi">

  <?include guids.wxi ?>
  <?include defines.wxi ?>

  <Fragment>
    <DirectoryRef Id="INSTALLDIR" FileSource="$(var.SourceDir)">
      <Component Id="distOutput" Guid="$(var.dist.guid)" Win64='$(var.IsX64)'>
        <File Name="python27.dll" KeyPath="yes" />
      </Component>
      <Directory Id="libdir" Name="lib" FileSource="$(var.SourceDir)/lib">
        <Component Id="libOutput" Guid="$(var.lib.guid)" Win64='$(var.IsX64)'>
          <File Name="library.zip" KeyPath="yes" />
          <File Name="mercurial.base85.pyd" />
          <File Name="mercurial.bdiff.pyd" />
          <File Name="mercurial.diffhelpers.pyd" />
          <File Name="mercurial.mpatch.pyd" />
          <File Name="mercurial.osutil.pyd" />
          <File Name="mercurial.parsers.pyd" />
          <File Name="pyexpat.pyd" />
          <File Name="bz2.pyd" />
          <File Name="select.pyd" />
          <File Name="unicodedata.pyd" />
          <File Name="_ctypes.pyd" />
          <File Name="_elementtree.pyd" />
          <File Name="_hashlib.pyd" />
          <File Name="_socket.pyd" />
          <File Name="_ssl.pyd" />
        </Component>
      </Directory>
    </DirectoryRef>
  </Fragment>

</Wix>