Fixes link building of buttons

6 jobs for master in 11 minutes and 5 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Install
passed #107228
nodejs
install_node_modules

00:01:16

 
  Test
failed #107230
nodejs allowed to fail
npm_test

00:02:22

passed #107229
nodejs
ts_lint

00:01:32

 
  Build
passed #107231
nodejs
build

00:03:55

 
  Assets
passed #107232
nodejs
generate_assets

00:03:18

 
  Deploy
passed #107233
rsync
deploy

00:00:14

 
Name Stage Failure
failed
npm_test Test
        at Zone.scheduleTask (./node_modules/zone.js/dist/zone.js?:231:43)
at Zone.scheduleEventTask (./node_modules/zone.js/dist/zone.js?:257:25)
at HTMLInputElement.eval [as addEventListener] (./node_modules/zone.js/dist/zone.js?:1830:33)
at DomEventsPlugin.addEventListener (./node_modules/@angular/platform-browser/fesm5/platform-browser.js?:1418:41)

npm info lifecycle arsnova-click-v2-frontend@1.0.0~test: Failed to exec test script
npm ERR! Test failed. See above for more details.
npm timing npm Completed in 80889ms
ERROR: Job failed: exit code 1