Make fancyopts handle no arguments
This lets hg serve work with no args.
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<title>#repo#: changeset #node#</title>
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<a href="?cmd=changelog;rev=#rev#">changelog</a>
<a href="?cmd=manifest;manifest=#manifest#;path=/">manifest</a>
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<h2>changeset: #shortdesc#</h2>
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<td class="metatag">revision:</td>
<td><a href="?cmd=changeset;node=#node#">#rev#:#node#</a></td></tr>
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<td class="metatag">manifest:</td>
<td><a href="?cmd=manifest;manifest=#manifest#;path=/">#rev#:#manifest#</a></td></tr>
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<td class="metatag">author:</td>
<td>#author#</td></tr>
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<td class="metatag">date:</td>
<td>#date#</td></tr>
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<td class="metatag" valign="top">files:</td>
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<td class="metatag" valign="top">description:</td>
<td>#desc#</td></tr>
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