title: Telegram Bot gets "Bad Request: message text is empty"
body: <p>When my Telegram bot sends sendMessage to Telegram server it gets the error message:</p>
  
  <pre><code>{"ok":false,"error_code":400,"description":"Bad Request: message text is empty"}
  </code></pre>
  
  <p>The problem appeared this morning, before that my bot worked a whole year without errors. GetUpdates command works well as before. I use GET HTTP method to send commads:</p>
  
  <pre><code>https://api.telegram.org/bot&lt;MyToken&gt;/sendMessage
  </code></pre>
  
  <p>with UTF-8-encoded data attached:</p>
  
  <pre><code>{"chat_id":123456789,"text":"any text"}
  </code></pre>
  
  <p>Has anyone encountered this?</p>