Custom Icons are possible

spec/pwa_test.js

@@ -31,7 +31,7 @@ describe('Service delivers a generated web-manifest', function () {
               enabled: true,
               name: 'Valid App Suite',
               shortName: 'Valid App Suite',
-              icon: '/themes/default/logo_512.png',
+              icon: '/mycustomlogo.png',
               iconWidthHeight: 512,
               backgroundColor: 'white'
             }
@@ -46,7 +46,7 @@ describe('Service delivers a generated web-manifest', function () {
       short_name: 'Valid App Suite',
       icons: [
         {
-          src: '/themes/default/logo_512.png',
+          src: '/mycustomlogo.png',
           type: 'image/png',
           sizes: '512x512',
           purpose: 'any'

src/plugins/webmanifest.js

@@ -69,7 +69,7 @@ async function fetchWebManifest (url) {
 function buildManifestFromData (userData) {
   const manifestData = {}
 
-  if (userData.icons) {
+  if (userData.icon) {
     manifestData.icons = [{
       src: userData.icon,
       type: getTypeFromPath(userData.icon),