-- Give run_isok_queries() an IQName that's not on ISOK_QUERIES
-- and see we get a good error message.
SELECT *
  FROM run_isok_queries($$VALUES ('non_existant_iqname')$$);
ERROR:  run_isok_queries: Error executing supplied query argument
DETAIL:  
The error is: 
Error in run_isok_queries(TEXT)

The detail is:
Supplied query returned a value (non_existant_iqname) that is not an existing ISOK_QUERIES.IQName value

The query is:
VALUES ('non_existant_iqname')

Additional diagnostic information:
PL/pgSQL function run_isok_queries(text) line 68 at RAISE
CONTEXT:  PL/pgSQL function run_isok_queries(text) line 422 at RAISE