External sites doesn't work after upgrade to NC11

[putt1ck]

Affected apps

External sites

Expected behaviour

After upgrade it should work as before or better

Actual behaviour

Server generates an error after login, have to disable the app at command line with 'occ app:disable external' to get server functional

Steps to reproduce

1. Upgrade from 10 to 11
2. Log in to server

3. ---

Server configuration

Operating system: Ubuntu 16.04.1 Web server: Apache2 Database: MySQL PHP version: 7

NextCloud log entry: "reqId":"RhP6WaJ7kXCXcCiJipFV","remoteAddr":"xx.xx.xx.xx","app":"index","message":"Exception: {\"Exception\":\"RuntimeException\",\"Message\":\"image not found: image:boltlogo.png webroot:\\/nextcloud serverroot:\\/var\\/www\\/html\\/nextcloud\",\"Code\":0,\"Trace\":\"#0 \\/var\\/www\\/html\\/nextcloud\\/apps\\/external\\/appinfo\\/app.php(38): OC\\URLGenerator->imagePath('external', 'boltlogo.png')\n#1 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/NavigationManager.php(64): OC_App::{closure}()\n#2 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/legacy\\/app.php(736): OC\\NavigationManager->getAll()\n#3 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/TemplateLayout.php(84): OC_App::getNavigation()\n#4 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/legacy\\/template.php(232): OC\\TemplateLayout->__construct('user', 'files')\n#5 \\/var\\/www\\/html\\/nextcloud\\/lib\\/public\\/AppFramework\\/Http\\/TemplateResponse.php(157): OC_Template->fetchPage()\n#6 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/AppFramework\\/Http\\/Dispatcher.php(113): OCP\\AppFramework\\Http\\TemplateResponse->render()\n#7 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/AppFramework\\/App.php(114): OC\\AppFramework\\Http\\Dispatcher->dispatch(Object(OCA\\Files\\Controller\\ViewController), 'index')\n#8 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/AppFramework\\/Routing\\/RouteActionHandler.php(47): OC\\AppFramework\\App::main('ViewController', 'index', Object(OC\\AppFramework\\DependencyInjection\\DIContainer), Array)\n#9 [internal function]: OC\\AppFramework\\Routing\\RouteActionHandler->__invoke(Array)\n#10 \\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/Route\\/Router.php(299): call_user_func(Object(OC\\AppFramework\\Routing\\RouteActionHandler), Array)\n#11 \\/var\\/www\\/html\\/nextcloud\\/lib\\/base.php(1010): OC\\Route\\Router->match('\\/apps\\/files\\/')\n#12 \\/var\\/www\\/html\\/nextcloud\\/index.php(40): OC::handleRequest()\n#13 {main}\",\"File\":\"\\/var\\/www\\/html\\/nextcloud\\/lib\\/private\\/URLGenerator.php\",\"Line\":206}","level":3,"time":"2017-01-03T14:43:03+00:00","method":"GET","url":"\/nextcloud\/index.php\/apps\/files\/","user":"foobar","version":"11.0.0.10"}

[putt1ck]

Now traced to use of a manual upgrade process, which didn't copy the logos from the old apps/external/img - although maybe it should be less sensitive to missing logo files?