title: Compare FALSE expression in Robot Framework Test Cases
body: <p>I'm having issue in negate the bool variable or comparison of FALSE against a bool variable to perform <code>Run Keyword If</code></p>
  
  <p>My Code is</p>
  
  <pre><code>Test Case
      ${isExist}=  Run Keyword And Return Status    Element Should Be Visible    ${element_Id}
      Run Keyword If     ${isExist} == false    click element ${cancelbtn}
  </code></pre>
  
  <p>Here I'm facing an Run time error</p>
  
  <blockquote>
    <p>Evaluating expression 'True and' failed: SyntaxError: unexpected EOF
    while parsing (, line 1)</p>
  </blockquote>
  
  <p>I tried the following comparison too</p>
  
  <ul>
  <li><code>${isExist} == 'false'</code> </li>
  <li><code>'${isExist}' == 'false'</code> </li>
  <li><code>${isExist} == ${false}</code> </li>
  <li><code>'${isExist}' == '${false}'</code> </li>
  <li><code>!${isExist}</code></li>
  </ul>
  
  <p>Note: <code>log to console    ${isExist}</code> - It logs the appropriate Boolean value in the console window.</p>