composePublicURL has invalid wadl

[Jelmer Vernooij]

The function returns a JSON string object directly, rather than e.g. using a dict.

See https://api.launchpad.net/devel/~bzr-pqm/bzr/bzr.dev?ws.op=composePublicURL&scheme=http

The WADL doesn't indicate that the function returns anything:

      <wadl:method id="branch-composePublicURL" name="GET">
        <wadl:doc xmlns="http://www.w3.org/1999/xhtml">
<p>Return a public URL for the branch using the given protocol.</p>
<table class="rst-docutils field-list" frame="void" rules="none">
<col class="field-name"/>
<col class="field-body"/>
<tbody valign="top">
<tr class="rst-field"><th class="rst-field-name">param scheme:</th><td class="rst-field-body">a protocol name accepted by the public
code-hosting API. (As a legacy issue, 'sftp' is also
accepted).</td>
</tr>
</tbody>
</table>

</wadl:doc>
        <wadl:request>

            <wadl:param style="query" name="ws.op" required="true" fixed="composePublicURL"/>
            <wadl:param style="query" name="scheme" required="true">
              <wadl:doc xmlns="http://www.w3.org/1999/xhtml">
URL scheme
</wadl:doc>

            </wadl:param>

        </wadl:request>

      </wadl:method>