Package page should give links to last working docs when new docs aren't built?

[gbaz]

From reddit: "It would be better to maybe have some copy around where the links are that says "The documentation for this version isn't available; the last version with documentation available is 0.0.1.0""

I do this all the time, just surfing backwards in versions until I get a haddock. Might be simpler to implement a small indicator next to each version indicating haddock present or not.