.jshintrc

bookmarks: avoid traceback when two pushes race to delete the same bookmark

`hg push -f -B remote-only-bookmark` can raise server-side in
`bookmarks._del` (specifically in `self._refmap.pop(mark)`), if the
remote-only bookmark got deleted concurrently.

Fix this by simply not deleting the non-existent bookmark in that
case.

For avoidance of doubt, refusing to delete a bookmark that doesn't
exist when the push starts is taking care of elsewhere; no change of
behavior there.

Differential Revision: https://phab.mercurial-scm.org/D8124

{
    // 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)
}