do not check username, as you are not allowed to change it

Dependencies

• [2] SZYDW2DG hydra: added some user admin
• [3] SMCOU72F hydra: add some admin for adding/enabling/etc build machines
• [4] F7S2EGV2 hydra: cannot change username, also update fullname
• [*] ZWCTAZGL added newsitems, added some admin options to clear various caches.

Change contents

• edit in src/lib/Hydra/Controller/Admin.pm at line 75
  [2.601]→[2.601:674](∅→∅)
  − error($c, "Invalid or empty username.") if $username eq "";

  −