title: IsFlag() not returning False when Flag Data Item is empty
body: <p>In Blue Prism v5, there is a function IsFlag() which can be used to evaluate if a Data Item is of type Flag. Normally in case of e.g. a Number, the function IsNumber() will return False in case the Data Item is empty. </p>
  
  <p>In my case (a Flag Data Item), the function IsFlag() does not return False when performing this expression in a decision stage.</p>
  
  <p>Can someone explain me why and give a possible solution for this?</p>
  
  <p>Solution that I already got from someone else: 
  - Evaluate if Flag is set to True
  - Put Decision stage in Block
  - Add Recover/Resume stage and set value to False (as 'default' value) before actually evaluating the condition you want to evaluate.</p>