if no previous successful build, do not show changes section

Dependencies

• [2] 22JB5HNE make changes section more compact/readable
• [*] J5UVLXOK * Start of a basic Catalyst web interface.
• [*] XHK7IGYI * hdyra: show last succeeded build and changes since on build status summary if build has failed
• [*] TW5ZQX5Z * Move up the build products in the builds page, since they're more

Change contents

• edit in src/root/build.tt at line 187
  [5.127]

  [2.0]
  + [% IF prevSuccessfulBuild %]
• edit in src/root/build.tt at line 213
  [2.1356]

  [6.56]
  + [% END %]