[ledger] error on empty balance

plugins/ledger.lisp

@@ -168,7 +168,8 @@
     (bot-send-message chat-id
                       (text-chunks (split-sequence:split-sequence
                                     #\Newline
-                                    (pta-ledger:journal-balance journal query))
+                                    (or (pta-ledger:journal-balance journal query)
+                                        "Не нашлось"))
                                    :text-sep "
 ")
                       :parse-mode "markdown")))