-ref: throws exceptions in some cases where the reference cannot be located

[Chuck]

This is normal:

> cobra -ref:badname hello
error: Cannot locate assembly reference "badname.dll".

But all of the following throw an exception instead of giving an error message:

cobra -ref:"C:\badname" hello
cobra -ref:C:\badname hello
cobra -ref:\badname hello

[hopscc]

patch+test+relnote

[Chuck]

This is already fixed through a combination of prior patches and/or my own tweaking.

In fact, I thought you had submitted a patch in this area that was applied some time ago. But maybe I'm remembering wrong.

In any case, the test cases above pass and I added your test case file in changeset:2048