minor output compatibility fixes

- suppress "None" in api page
- show yes/no for dist repo flag

www/kojiweb/templates/api.html.j2

@@ -28,7 +28,7 @@ except koji.GenericError:
 #for method in methods
   <li>
      <pre><b>{{ method['name'] ~ method['argdesc'] }}</b>
-  {{ method['doc'] }}
+  {{ method['doc'] if method['doc'] is not none else '' }}
      </pre>
   </li>
 #endfor

www/kojiweb/templates/repoinfo.html.j2

@@ -15,7 +15,7 @@
   <tr><th>URL</th><td><a href="{{ url }}">repodata</a></td></tr>
   <tr><th>Repo json</th><td><a href="{{ repo_json }}">repo.json</a></td></tr>
   {%- endif %}
-  <tr><th>Dist repo?</th><td class="{{ repo.dist | lower }}">{{ repo.dist }}</td></tr>
+  <tr><th>Dist repo?</th><td class="{{ repo.dist | lower }}">{{ 'yes' if repo.dist else 'no' }}</td></tr>
   <tr><th>Number of buildroots: </th><td><a href="buildroots?repoID={{ repo.id }}">{{ numBuildroots }}</a></td></tr>
 </table>
 {% else %}