Verifying if a parameter is empty is very intuitive in Qualibrate. Basically, you use the Verify user action and you apply the 'Does not equal' operator on the parameter left empty.
Follow this simple example and apply it to your own test case:
Step1. Record Verify action
Step2. Go to Configuration option on the recorder
Step3. Change the Verification Operator to “Does not equal” in the Basic settings and press Save:
Step4. Delete value from “Recorded value” on the recorder.
Step5. Save your recording