Messaging hangs if the client sends a junk filepath

[alanz]

I have a misconfiguration of my emacs, and under some circumstances it sends a junk filepath when trying to jump to a search result.

e.g.
src/Language/Haskell/Refact/Refactoring/src/Language/Haskell/Refact/Refactoring/Foo.hs instead of
src/Language/Haskell/Refact/Refactoring/Foo.hs

But, when this happens, hie hangs and does not send any further reply messages.

Under no circumstances should hie ever stop responding.