lib/scanner: Don't report error on missing items (fixes #5385) (#5387)

lib/scanner/walk.go

@@ -535,7 +535,12 @@ func (w *walker) updateFileInfo(file, curFile protocol.FileInfo) protocol.FileIn
 	file.LocalFlags = w.LocalFlags
 	return file
 }
+
 func (w *walker) handleError(ctx context.Context, context, path string, err error, finishedChan chan<- ScanResult) {
+	// Ignore missing items, as deletions are not handled by the scanner.
+	if fs.IsNotExist(err) {
+		return
+	}
 	l.Infof("Scanner (folder %s, file %q): %s: %v", w.Folder, path, context, err)
 	select {
 	case finishedChan <- ScanResult{