.jshintrc

revlog: always process opener options

I'm not sure when ``opener.options`` would ever be explicitly
set to None. It is definitely not possible to construct a repo
this way because ``localrepo.resolvestorevfsoptions()`` always
returns a dict and ``localrepo.makelocalrepository()`` always
sets ``opener.options`` to this value.

Because we always execute this code now, if options are empty
we defaulted to creating version 0 revlogs. So we had to change
the code slightly to fall back to the default revlog version
and flags.

As astute reader will note that it is not possible to create
version 0 revlogs now. However, I don't think it was possible
before, as this required ``opener.options`` being unset, which
I don't think was possible. I suspect this means our test
coverage for version 0 revlog repositories is possibly
non-existent! Since I don't see a config option to disable
revlog v1, I'm not even sure if we had a way to create new
repos with version 0 revlogs! Who knows.

Differential Revision: https://phab.mercurial-scm.org/D5559

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}