Bas van Dijk 527781ebc4 apache-httpd: fix nix evaluation error
This only sets the timezone when it's not null to prevent:

  error: cannot coerce null to a string, at
  nixpkgs/nixos/modules/services/web-servers/apache-httpd/default.nix:676:7
2017-10-31 17:33:54 +01:00
..
2017-10-07 01:48:03 +02:00
2017-10-25 20:53:44 +01:00
2017-10-29 19:29:25 -05:00