title: How can I do Null and empty check of arraylist using dw() function in mule?
body: <p>I tried the following way,</p>
  <h1>[dw('sizeOf payload.data.accts')&gt;0] but hthis would just check if arraylist  is empty or not .So i need a help  to how do I null check on &quot;accts&quot; arraylist using dw() function.</h1>
  <p>I want both null and empty check in dw() function of mule so that I can use it in my choice router to proceed my flow.</p>