NicolasPetton/amber — pull request #290 by noha (2013-01-09 18:16:25+00:00)
Title: JSObjectProxy>>#doesNotUnderstand: treats undefined values as missing selector

Fixed a bug in JSObjectProxy>>#doesNotUnderstand: The check for
an existing property was evaluating the property content. So
a missing property and an existing property with undefined value
both triggered MessageNotUnderstood.
Fix and tests are included