fix(vouchers): catch no-filter corner case

This commit catches the default corner case where no filters have been initialized in the browser and appcache.  It fixes this by ensuring that there is always some filters cached.

Closes #1466.

client/src/partials/vouchers/index.js

@@ -18,10 +18,11 @@ function VoucherController(Vouchers, Notify, Filtering, uiGridGroupingConstants,
   uiGridConstants, bhConstants, Receipts, Sorting, $state, AppCache,
   Filters) {
   var vm = this;
+  var cache = new AppCache('VoucherRegistry');
+
   var filter = new Filters();
   var filtering;
   var FILTER_BAR_HEIGHT;
-  var cache = new AppCache('VoucherRegistry');
 
   var INCOME = bhConstants.transactionType.INCOME;
   var EXPENSE = bhConstants.transactionType.EXPENSE;
@@ -249,6 +250,7 @@ function VoucherController(Vouchers, Notify, Filtering, uiGridGroupingConstants,
     if ($state.params.filters) {
       cacheFilters($state.params.filters);
     }
+    cacheFilters({});
 
     vm.filters = cache.filters;
     vm.filtersFmt = Vouchers.formatFilterParameters(vm.filters || {});