Throwing an exeception in a rule function breaks the engine

[nickgrealy]

Steps to reproduce

Open http://jsfiddle.net/mjahomzu/3/
Select "cow & cat"

Actual Outcome

An exception is thrown, and the last rule is not evaluated.

Expected Outcome

No exception is thrown (treated as rule matched = false), and the last rule is evaluated.

Code snippet

var throwException = function(){ throw 'arrrgghh!'; }

var rules = [
    ['control1'    , 'p_section'],
    [throwException, 'hide'     ],
    ['foobar'      , 'show'     ]
]

RulesEngine.build(rules, showHideFn, false).evaluate({'control1':'foobar'})