* Parser: add recovery for missing fields after 'of' in union case

* Remove redundant opt_OBLOCKSEP

* Recover in exceptions too

* Fix test

* Update test baseline

* Add second warning

* Update tests/fsharpqa/Source/Conformance/BasicTypeAndModuleDefinitions/UnionTypes/W_UnionCaseProduction01.fsx
Co-authored-by: NPhillip Carter <pcarter@fastmail.com>
Co-authored-by: NPhillip Carter <pcarter@fastmail.com>