New longitudinal fails for program encounter with no cancellation form

[nupoorkhandelwal]

Describe the bug
Currently, the new longitudinal export fails when a program encounter in the request is not mapped to a Cancel form.

To Reproduce
Steps to reproduce the behavior:

1. Go to "Yenepoya" org >> Reports >> New Longitudinal Export
2. Request json - With comments - https://github.com/avniproject/yenepoya/blob/master/New%20longitudinal%20request.json
3. Remove comments and see the request fails and there is no downloadable error file
4. Now remove the "Delivery" encounter under Pregnancy program >> The request will run and give results
5. Basically, the Delivery encounter do not have Cancellation form.

Expected behavior
So, even if the cancel form is not mapped, the new longitudinal export should work fine

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Developer Checklist(Developer fixing the bug should fill this checklist)

• Does the fix require extensive regression testing?
  • Yes
  • No
• Are you mentioning the required scenarios that could be affected?
  • Yes
  • No

[mahalakshme]

@nupoorkhandelwal you are right, its because the encounter type doesn't have cancellation form. would like to know why is that some encounter types need not have cancellation form.

[nupoorkhandelwal]

@mahalakshme It is possible to remove the cancel form mapping under Forms, and since this is Delivery encounter, as part of requirement it must have been removed by implementor at some piont.