Merge pull request #5599 from nextcloud/backport/5572/stable28

[stable28] fix: Catch exceptions on non existing files

lib/Listeners/BeforeNodeWrittenListener.php

@@ -31,6 +31,7 @@
 use OCP\EventDispatcher\IEventListener;
 use OCP\Files\Events\Node\BeforeNodeWrittenEvent;
 use OCP\Files\File;
+use OCP\Files\NotFoundException;
 
 /**
  * @template-implements IEventListener<Event|BeforeNodeWrittenEvent>
@@ -47,15 +48,19 @@ public function handle(Event $event): void {
 			return;
 		}
 		$node = $event->getNode();
-		if ($node instanceof File && $node->getMimeType() === 'text/markdown') {
-			if (!$this->documentService->isSaveFromText()) {
-				// Reset document session to avoid manual conflict resolution if there's no unsaved steps
-				try {
-					$this->documentService->resetDocument($node->getId());
-				} catch (DocumentHasUnsavedChangesException) {
-					// Do not throw during event handling in this is expected to happen
+		try {
+			if ($node instanceof File && $node->getMimeType() === 'text/markdown') {
+				if (!$this->documentService->isSaveFromText()) {
+					// Reset document session to avoid manual conflict resolution if there's no unsaved steps
+					try {
+						$this->documentService->resetDocument($node->getId());
+					} catch (DocumentHasUnsavedChangesException) {
+						// Do not throw during event handling in this is expected to happen
+					}
 				}
 			}
+		} catch (NotFoundException) {
+			// This might occur on new files when a NonExistingFile is passed and we cannot access the mimetype
 		}
 	}
 }