Fix eww-mu4e-messages

eww/eww-mu4e-messages

@@ -2,6 +2,7 @@
 ;;; -*- mode: emacs-lisp; lexical-binding: t -*-
 (require 'server)
 (princ
+ (condition-case _
      (if-let ((modeline-string (server-eval-at "server" '(mu4e--modeline-string)))
               ((string-match "\\([0-9]+\\)\\((\\+1)\\)?/[0-9]+ $" modeline-string))
               (matched-string (match-string 1 modeline-string)))
@@ -10,5 +11,7 @@
                                 nil 
                                 matched-string)
            matched-string)
-   "0"))
+       "0")
+   (error
+    "0")))
 (terpri)