[Hackage] #954: setup haddock fails for packages without modules

#954: setup haddock fails for packages without modules
----------------------------+-----------------------------------------------
  Reporter:  nomeata        |        Owner:        
      Type:  defect         |       Status:  new   
  Priority:  normal         |    Milestone:        
 Component:  Cabal library  |      Version:  1.14.0
  Severity:  normal         |     Keywords:        
Difficulty:  unknown        |   Ghcversion:        
  Platform:                 |  
----------------------------+-----------------------------------------------
 http://hackage.haskell.org/package/diagrams-0.5 is a meta-package, i.e.
 only depends on other packages. Running setup haddock fails:
 {{{
 $ ./Setup haddock --hyperlink-source
 Running Haddock for diagrams-0.5...
 Running hscolour for diagrams-0.5...
 Preprocessing library diagrams-0.5...
 Warning: The documentation for the following packages are not installed.
 No
 links will be generated to these packages: rts-1.0
 Preprocessing library diagrams-0.5...
 haddock: No input file(s).
 }}}

 Not a big deal, but still a corner-case that could be fixed.

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Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/954>
Hackage <http://haskell.org/cabal/>
Hackage: Cabal and related projects