756af9d5bc
Handle no values cfgs with `--print=check-cfg` This PR fix a bug with `--print=check-cfg`, where no values cfgs where not printed since we only printed cfgs that had at least one values. The representation I choose is `CFG=`, since it doesn't correspond to any valid config, it also IMO nicely complements the `values()` (to indicate no values). Representing the absence of value by the absence of the value. So for `cfg(feature, values())` we would print `feature=`. I also added the missing tracking issue number in the doc. r? ```@petrochenkov```
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