codeclimate/codeclimate-rubocop

The safe navigation operator returns nil if the receiver is
nil.  If you chain an ordinary method call after a safe
navigation operator, it raises NoMethodError.  We should use a
safe navigation operator after a safe navigation operator.
This cop checks for the problem outlined above.

### Example:

    # bad

    x&.foo.bar
    x&.foo + bar
    x&.foo[bar]

### Example:

    # good

    x&.foo&.bar
    x&.foo || bar