Details
Description
Gene reports an annoying problem, in that Terrier's Manager class doesn't check that the Index passed to it is valid (i.e. not null).
Its trivial to check, and we can then report a more sensible error message than we do currently.
Its trivial to check, and we can then report a more sensible error message than we do currently.
Added trivial check in Manager, and a test case for Manager that checks the exception is raised.