Don't generate links when dependent docs not installed. Fixes bug #157. Generates a warning rather than failing as before.
Don't generate links when dependent docs not installed. Fixes bug #157.
Generates a warning rather than failing as before.

mydaum/cabal,plow-technologies/cabal,x-y-z/cabal,Peaker/cabal,christiaanb/cabal,mightybyte/cabal,lukexi/cabal,edsko/cabal,triplepointfive/cabal,eric-stanley/cabal,corngood/cabal,ghc-android/cabal,themoritz/cabal,gridaphobe/cabal,mydaum/cabal,fpco/cabal,typelead/epm,christiaanb/cabal,typelead/epm,plumlife/cabal,rimmington/cabal,martinvlk/cabal,edsko/cabal,themoritz/cabal,gridaphobe/cabal,Helkafen/cabal,fugyk/cabal,bennofs/cabal,anton-dessiatov/cabal,mightybyte/cabal,ian-ross/cabal,fugyk/cabal,thoughtpolice/cabal,kosmikus/cabal,bennofs/cabal,valderman/cabal,beni55/cabal,plow-technologies/cabal,kolmodin/cabal,sopvop/cabal,trskop/cabal,martinvlk/cabal,x-y-z/cabal,mmakowski/cabal,beni55/cabal,seereason/cabal,lukexi/cabal,alphaHeavy/cabal,ghc-android/cabal,enolan/cabal,thomie/cabal,garetxe/cabal,anton-dessiatov/cabal,corngood/cabal,enolan/cabal,Helkafen/cabal,valderman/cabal,mmakowski/cabal,seereason/cabal,kolmodin/cabal,headprogrammingczar/cabal,headprogrammingczar/cabal,rimmington/cabal,Heather/cabal,sopvop/cabal,plumlife/cabal,ian-ross/cabal,fpco/cabal,Heather/cabal,randen/cabal,gbaz/cabal,sopvop/cabal,alphaHeavy/cabal,kosmikus/cabal,gbaz/cabal,triplepointfive/cabal,thomie/cabal,themoritz/cabal,eric-stanley/cabal,Peaker/cabal,garetxe/cabal,trskop/cabal,randen/cabal,thoughtpolice/cabal