ONCONDCOND returns a nonvarying character string whose value is
the name of the condition for which a CONDITION condition is raised.
If the name is a DBCS name, it will be returned as a mixed character
string. It is in context in the following circumstances:
- In a CONDITION ON-unit, or any of its dynamic descendants
- In an ANYCONDITION ON-unit that traps a CONDITION condition, or any dynamic descendants of such an ON-unit.
>>-ONCONDCOND-+----+------------------------------------------->< '-()-'
If ONCONDCOND is used out of context, a null string is returned.