title: How to set a value to a variable if it is empty
body: <p>I am preparing a script to automate a test in a website through the selenium robot framework.</p>
  
  <p>There is one XPath that returned <code>${EMPTY}</code> and I am trying to assign 0 but it is displaying following error.</p>
  
  <pre><code>Evaluating expression ' == ''' failed: syntaxerror: no viable alternative at input '==' (&lt;string&gt;, line1)
  </code></pre>
  
  <p>Here is what I wrote:</p>
  
  <pre><code>  column1   |      column2      |         column3        |    column4
  -------------------------------------------------------------------------
    ${var1}=  |  Set Variable if  |   ${var1}=='${EMPTY}'  |  ${var1}==0
  </code></pre>
  
  <p>Will you please help me with the solution?</p>
  
  <p>Thank You
  Yogi</p>