[hail] remove confusing try-catch (#6156)
[hail] remove confusing try-catch (#6156)

* [hail] remove confusing try-catch

This catch was masking a `org.json4s.package$MappingException: Parsed JSON values do not match with class constructor`
as a `NullPointerException` on line 148. Exceptions always include
their cause in the stack trace, I see no compelling reason to
maintain this try-catch.

* Update Parser.scala

* Update Parser.scala

* Update Parser.scala

*  more fixes

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