title: How to null check List in Robot FrameWork
body: <pre><code>    ${rowcount}=    Keyword1    Book1.xlsx    0
      ${length}=    Set Variable    ${rowcount}
      ${i}    Set Variable    1
     :FOR    ${rowvalue}    IN RANGE    ${rowcount}
     \    @{columnlist}=    Keyword2    ${rowvalue}
  </code></pre>
  
  <p><code>Keyword2</code> is returning List of data. I want to check whether it is returning <code>Empty</code> List. Please help me with this?</p>