passing Empty Array to directive

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Hi

I am using **dirPagination** directive, i have a problem with passing empy array to it.

i have a table and a search field that search results show in table, when the result is empty, table rows does not delete from table,

i find this condition in directive

`scope.$watchCollection(function() {
return collectionGetter(scope);
}, function(collection) {
if (collection) {
paginationService.setCollectionLength(paginationId, collection.length);
}
});`

i think `if(collection)` make some problems.

Start at the dirPagination directive's $watchCollection callback shown in the issue and trace how collection changes update the pagination service and table rows. Reproduce the empty-search-result case, then verify that passing an empty array removes the existing rows without breaking pagination.

Written by the indexing model from the issue text.