built.tt: Handle the case where the original build is not known

Dependencies

• [2] 2GUAKGTB Fix indentation of build.tt
• [3] CAFO4ATE Always show the build duration (using the cached build if necessary)
• [4] 36M6DGIT Show the runtime/build dependencies in the build page
• [5] MMJYE535 Also show number of evaluations of which a build is a part
• [6] K22TMPH5 Make the info tables less compressed
• [*] J5UVLXOK * Start of a basic Catalyst web interface.

Change contents

• replacement in src/root/build.tt at line 146
  [2.3273]→[2.3273:3350](∅→∅)
  − <td>[% INCLUDE renderFullBuildLink build=cachedBuild %]</td>
  [2.3273]

  [2.3614]
  + <td>[% IF cachedBuild; INCLUDE renderFullBuildLink build=cachedBuild; ELSE %]<em>unknown</em>[% END %]</td>
• replacement in src/root/build.tt at line 269
  [2.8083]→[2.8083:8202](∅→∅)
  − <td>[% IF build.description %][% HTML.escape(build.description) %][% ELSE %]<em>(not given)</em>[% END %]</td>
  [2.8083]

  [2.8202]
  + <td>[% IF build.description %][% HTML.escape(build.description) %][% ELSE %]<em>not given</em>[% END %]</td>
• replacement in src/root/build.tt at line 273
  [2.8260]→[2.8260:8387](∅→∅)
  − <td>[% IF build.longdescription %][% HTML.escape(build.longdescription) %][% ELSE %]<em>(not given)</em>[% END %]</td>
  [2.8260]

  [2.8387]
  + <td>[% IF build.longdescription %][% HTML.escape(build.longdescription) %][% ELSE %]<em>not given</em>[% END %]</td>
• replacement in src/root/build.tt at line 277
  [2.8436]→[2.8436:8547](∅→∅)
  − <td>[% IF build.license %][% HTML.escape(build.license) %][% ELSE %]<em>(not given)</em>[% END %]</td>
  [2.8436]

  [2.8547]
  + <td>[% IF build.license %][% HTML.escape(build.license) %][% ELSE %]<em>not given</em>[% END %]</td>
• replacement in src/root/build.tt at line 281
  [2.8597]→[2.8597:8763](∅→∅)
  − <td>[% IF build.homepage %]<a [% HTML.attributes(href => build.homepage) %]>[% HTML.escape(build.homepage) %]</a>[% ELSE %]<em>(not given)</em>[% END %]</td>
  [2.8597]

  [2.8763]
  + <td>[% IF build.homepage %]<a [% HTML.attributes(href => build.homepage) %]>[% HTML.escape(build.homepage) %]</a>[% ELSE %]<em>not given</em>[% END %]</td>
• replacement in src/root/build.tt at line 285
  [2.8818]→[2.8818:8937](∅→∅)
  − <td>[% IF build.maintainers %][% HTML.escape(build.maintainers) %][% ELSE %]<em>(not given)</em>[% END %]</td>
  [2.8818]

  [2.8937]
  + <td>[% IF build.maintainers %][% HTML.escape(build.maintainers) %][% ELSE %]<em>not given</em>[% END %]</td>