Explicitly define behavior of empty tls_options
#291
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I'd like to add these tests since this behavior may be unexpected, in particular for users of the omniauth-ldap gem https://github.com/intridea/omniauth-ldap/blob/master/lib/omniauth-ldap/adaptor.rb#L93).
Additionally, if this behavior changes (for example, by removing
unless tls_options.empty?
https://github.com/ruby-ldap/ruby-net-ldap/pull/161/files#diff-8f385efd0cd6c068dec9c5db605a4d36R51), these tests would fail, and therefore help to ensure that the breaking change is deliberate.Thanks!