contrib/wix/help.wxs

convert: handle empty intial commits while converting to svn

Svn commit generation code skips empty commits, returning the parent.
Skipping the root commit must return None instead.

Added test to check skipping of empty commits.

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

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

  <Fragment>
    <ComponentGroup Id='helpFolder'>
      <ComponentRef Id='help.root' />
      <ComponentRef Id='help.internals' />
    </ComponentGroup>
  </Fragment>

  <Fragment>
    <DirectoryRef Id="INSTALLDIR">
      <Directory Id="helpdir" Name="help" FileSource="$(var.SourceDir)">
        <Component Id="help.root" Guid="$(var.help.root.guid)" Win64='$(var.IsX64)'>
          <File Name="bundlespec.txt" />
          <File Name="color.txt" />
          <File Name="config.txt" KeyPath="yes" />
          <File Name="dates.txt" />
          <File Name="deprecated.txt" />
          <File Name="diffs.txt" />
          <File Name="environment.txt" />
          <File Name="extensions.txt" />
          <File Name="filesets.txt" />
          <File Name="flags.txt" />
          <File Name="glossary.txt" />
          <File Name="hgignore.txt" />
          <File Name="hgweb.txt" />
          <File Name="merge-tools.txt" />
          <File Name="pager.txt" />
          <File Name="patterns.txt" />
          <File Name="phases.txt" />
          <File Name="revisions.txt" />
          <File Name="scripting.txt" />
          <File Name="subrepos.txt" />
          <File Name="templates.txt" />
          <File Name="urls.txt" />
        </Component>

        <Directory Id="help.internaldir" Name="internals">
          <Component Id="help.internals" Guid="$(var.help.internals.guid)" Win64='$(var.IsX64)'>
            <File Id="internals.bundle2.txt"      Name="bundle2.txt" />
            <File Id="internals.bundles.txt"      Name="bundles.txt" KeyPath="yes" />
            <File Id="internals.cbor.txt"         Name="cbor.txt" />
            <File Id="internals.censor.txt"       Name="censor.txt" />
            <File Id="internals.changegroups.txt" Name="changegroups.txt" />
            <File Id="internals.config.txt"       Name="config.txt" />
            <File Id="internals.extensions.txt"   Name="extensions.txt" />
            <File Id="internals.linelog.txt"      Name="linelog.txt" />
            <File Id="internals.requirements.txt" Name="requirements.txt" />
            <File Id="internals.revlogs.txt"      Name="revlogs.txt" />
            <File Id="internals.wireprotocol.txt" Name="wireprotocol.txt" />
            <File Id="internals.wireprotocolrpc.txt" Name="wireprotocolrpc.txt" />
            <File Id="internals.wireprotocolv2.txt" Name="wireprotocolv2.txt" />
          </Component>
        </Directory>

      </Directory>
    </DirectoryRef>
  </Fragment>

</Wix>