fix sbcl consumer-tag slot init warning

Author: deadtrickster

cl-bunny.asd

@@ -6,7 +6,7 @@
 (in-package :cl-bunny.system)
 
 (defsystem :cl-bunny
-  :version "0.4.5"
+  :version "0.4.6"
   :description "Common Lisp RabbitMQ client based on IOLib"
   :maintainer "Ilya Khaprov <ilya.khaprov@publitechs.com>"
   :author "Ilya Khaprov <ilya.khaprov@publitechs.com>"

src/message.lisp

@@ -5,7 +5,7 @@
                  :initarg :channel
                  :reader message-channel)
    (consumer-tag :type string
-                 :initform nil
+                 :initform ""
                  :initarg :consumer-tag
                  :reader message-consumer-tag)
    (consumer     :type consumer