Output when missing Hex doc configuration could be improved

[eproxus]

Currently, in projects with "legacy" configuration (no {hex, [{doc, ...}]} configuration the following output is generated when running rebar3 hex and rebar3 hex docs:

$ rebar3 hex docs
===> Verifying dependencies...
===> No valid hex docs configuration found. Docs will will not be generated
Local Password:
===> Published docs for grisp 2.0.0-rc1

I think it is confusing because the "No valid hex docs..." line is red and seems to indicate an error, an then the docs are published anyway (most likely stale since the plug-in will no longer re-generate the docs without the correct undocumented configuration).

[starbelly]

Right, what we can do here for v6.11.x is check to see if there's doc provider config, but then also check to see if there's a doc dir with at least an index file in it, if so, then don't warn.

Likewise, we should omit "Published docs..." if either of the above don't hold true.

[starbelly]

@eproxus Merged bug fix and published v6.11.8 to hex.pm . Closing this as resolved.