BUGFIX: Allow managing personal workspaces without owners

Under certain circumstances personal workspaces exist
without an owner. It was impossible to delete or modify those
workspaces.
This changes makes it possible for admins to delete them.

Classes/Controller/WorkspacesController.php

@@ -132,7 +132,7 @@ public function deleteAction(Workspace $workspace): void
         /** @var Workspace[] $rebasedWorkspaces */
         $rebasedWorkspaces = [];
 
-        if ($workspace->isPersonalWorkspace()) {
+        if ($workspace->isPersonalWorkspace() && $workspace->getOwner() !== null) {
             $this->addFlashMessage(
                 $this->translateById('message.workspaceIsPersonal', ['workspaceName' => $workspace->getTitle()]),
                 '',
@@ -301,7 +301,7 @@ protected function getWorkspaceInfo(Workspace $workspace): array
             'isInternal' => $workspace->isInternalWorkspace(),
             'isStale' => $isStale,
             'canPublish' => $this->userService->currentUserCanPublishToWorkspace($workspace),
-            'canManage' => $this->userService->currentUserCanManageWorkspace($workspace),
+            'canManage' => $this->canManageWorkspace($workspace),
             'dependentWorkspacesCount' => count($this->workspaceRepository->findByBaseWorkspace($workspace)),
             'creator' => $creator ? [
                 'id' => $creator,
@@ -650,4 +650,13 @@ protected function validateWorkspaceChain(Workspace $workspace): bool
         return true;
     }
 
+    protected function canManageWorkspace(Workspace $workspace): bool
+    {
+        // Workaround to make personal workspaces with missing owners manageable
+        if ($workspace->isPersonalWorkspace() && !$workspace->getOwner()) {
+            return $this->privilegeManager->isPrivilegeTargetGranted('Neos.Neos:Backend.Module.Management.Workspaces.ManageAllPrivateWorkspaces');
+        }
+        return $this->userService->currentUserCanManageWorkspace($workspace);
+    }
+
 }