Add sanity checks for II_SYSTEM and error catching common environment issues

[clach04]

Internal reference II-11012

Catch:

sqlalchemy.exc.DBAPIError: (pyodbc.Error) ('IM004', "[IM004] [unixODBC][Driver Manager]Driver's SQLAllocHandle on SQL_HANDLE_HENV failed (0) (SQLDriverConnect)")
(Background on this error at: https://sqlalche.me/e/14/dbapi)

Typically happens when II_SYSTEM is not set and UnixODBC is being used (i.e. not an issue under Windows with auto II_SYSTEM setting based DLL location in path, II_SYSTEM etc. is derived)