[GHC] #1593: Improve runInteractiveProcess error message when working directory does not exist

[GHC]

#1593: Improve runInteractiveProcess error message when working directory does not
exist
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  Reporter:  tomasz.zielonka@…          |          Owner:  simonmar        
      Type:  task                       |         Status:  new             
  Priority:  low                        |      Milestone:  _|_             
 Component:  libraries/process          |        Version:  6.7             
Resolution:                             |       Keywords:                  
        Os:  Unknown/Multiple           |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown               |     Difficulty:  Unknown         
  Testcase:  process004                 |      Blockedby:                  
  Blocking:                             |        Related:                  
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Comment(by simonmar):

 Still needs fixing, yes.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1593#comment:13>
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