Always remove empty keyword hashes when calling methods

While doing so is not backwards compatible with Ruby 2.6, it is
necessary for generic argument forwarding to work for all methods:

```ruby
def foo(*args, **kw, &block)
  bar(*args, **kw, &block)
end
```

If you do not remove empty keyword hashes, and bar does not accept
keyword arguments, then a call to foo without keyword arguments
calls bar with an extra positional empty hash argument.

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