Minor code cleanup.

src/Request.php

@@ -219,12 +219,12 @@ class Request
         }
 
         // Make sure we have a string to work with.
-        if (is_string($input)) {
-            self::$input = $input;
-        } else {
+        if (!is_string($input)) {
             throw new TelegramException('Input must be a string!');
         }
 
+        self::$input = $input;
+
         TelegramLog::update(self::$input);
 
         return self::$input;
@@ -404,6 +404,7 @@ class Request
      * Send command
      *
      * @todo Fake response doesn't need json encoding?
+     * @todo Write debug entry on failure
      *
      * @param string $action
      * @param array  $data