title: Conditions in yaml pipeline like "eq" and "ne" is not working
body: <p>I have created a pipeline build variable "svctag" and assigned its value to blank (empty string). Now trying to execute below script inside a job in yaml file. Every time it prints "svctag is not blank". Not sure what I am doing wrong.
  Please help.</p>
  
  <pre><code>- ${{ if eq('$(svctag)', '') }}:
     - script: echo 'svctag is blank'
  - ${{ if ne('$(svctag)', '') }}:
     - script: echo 'svctag is not blank'
  </code></pre>