[GHC] #8981: ghc-pkg complains about missing haddock interface files

[GHC]

#8981: ghc-pkg complains about missing haddock interface files
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        Reporter:  thoughtpolice     |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  ghc-pkg           |                 Version:  7.8.1
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:  x86_64
 Type of failure:  Incorrect result  |  (amd64)
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by thomie):

 See #10305 for an instance of this bug when running validate or a normal
 ghc build with `HADDOCK_DOCS=NO`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8981#comment:9>
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