Filter strategy constructor should not need filter

[bartvde]

My use case is: at the startup of my application, I want to show all features. Then later on users can control the visibility of features by using checkboxes in a legend, so I will use setFilter then. However, now I have to instantiate my Filter strategy with something like (a filter that matches everything):

    new OpenLayers.Strategy.Filter({
        filter: new OpenLayers.Filter.Comparison({type: OpenLayers.Filter.Comparison.LIKE, property: 'categorie', value: ''})
    })

How about allowing instantiating the strategy with no filter?

[bartvde]

Tests still pass in FF 3.6, please review.

[tschaub]

filter strategy without filter

[tschaub]

There's no reason to take all features off the event and then push them back. If you agree, please commit the version I put up.

[bartvde]

Thanks Tim, that makes more sense indeed.

[bartvde]

r10879