Fix writing to a file only when the option is set.

src/cipher_analytical_machine/cli.clj

@@ -69,10 +69,12 @@
       (map-has-keys? options [:message, :message-file])
       {:exit-message (error-msg ["You can't use message and message-file options at the same time!!!"])}
 
-      (file/is-file-not-exists? (:message-file options))
+      (and (contains? options :message-file)
+           (file/is-file-not-exists? (:message-file options)))
       {:exit-message (error-msg ["Please, check the path to the message file!!!"])}
 
-      (file/is-file-exists? (:output-file options))
+      (and (contains? options :output-file)
+           (file/is-file-exists? (:output-file options)))
       {:exit-message (error-msg ["Please, choose another file!!! Overwriting was prevented!!!"])}
 
       (and (map-has-keys? options [:cipher, :key])
@@ -145,7 +147,8 @@
 (defn show-and-save-output
   "Print and save the output to a file if needed"
   [output options]
-  (save-output output options)
+  (when (contains? options :output-file)
+    (save-output output options))
   (println output))
 
 (defn cracking-actions