Handling Null and other custom errors

Handling Null and other custom errors

Hi,

Using a stateless form & HTML-page (view) i am trying to genreate a custom report dynamically.

My stateless form has a single field -- Unique ID.
I pass this as a parameter to my HTML-view
I fetch records from 3 other forms / views based on this unique ID
and then display the consolidated info in the html view / page
using "insert expression"

Everything was working great..
and i am seeing the expected resutls.

But, i would like custom messages for scenarios like
where there is "no data" in a certain field ( null)
.. and other custom errors with more descriptive info


Please advice
Thank you,
Regards.
Deepa