Fix some warnings about undefined values

Dependencies

• [2] 3TL5XENE Different icons (darker red) for cancelled builds. Fixes #25.
• [3] HFJPPMTU Cleanup
• [4] D6ET5EQ6 Doh
• [5] KG5AMUMG Cleanup
• [6] RWFCW6ZN In the jobset evals lists, show what inputs changed between consecutive evals
• [*] 3HZY24CX * Make jobsets viewable under
• [*] J5UVLXOK * Start of a basic Catalyst web interface.
• [*] MVB7RRLT * Move NARs from the NixChannel controller to the Root controller and
• [*] SZYDW2DG hydra: added some user admin
• [*] HRAFVVOE make logo configurable via HYDRA_LOGO env var

Change contents

• replacement in src/lib/Hydra/Controller/Jobset.pm at line 364
  [3.1201]→[2.140:265](∅→∅)
  − if !defined $p || $input->revision ne $p->revision || $input->type ne $p->type || $input->uri ne $p->uri ||
  [3.1201]

  [2.265]
  + if !defined $p || ($input->revision || "") ne ($p->revision || "") || $input->type ne $p->type || ($input->uri || "") ne ($p->uri || "") ||
• edit in src/lib/Hydra/Controller/Root.pm at line 196
  [10.683]

  [10.683]
  +
• edit in src/lib/Hydra/Controller/Root.pm at line 198
  [10.684]

  [11.3042]
  + sub narinfo :Path('*.narinfo') {

  + my ($self, $c) = @_;

  + $c->stash->{current_view} = 'NixInfo';

  + }

  +

  +
• edit in src/lib/Hydra/Controller/Root.pm at line 211
  [11.3232]

  [11.3232]
  +
• edit in src/lib/Hydra/Controller/Root.pm at line 230
  [10.685]

  [12.280]
  +