Bug 1466873 - [tps] Allow date property be optional when matching history entries; r=markh

MozReview-Commit-ID: 98eR1XFYpwE

--HG--
extra : rebase_source : 21939f3abd0874bbcb4da0b5bb5b3d17fdee06a4

services/sync/tps/extensions/tps/resource/modules/history.jsm

@@ -86,8 +86,10 @@ var HistoryEntry = {
       for (let itemvisit of item.visits) {
         // Note: in microseconds.
         let expectedDate = itemvisit.date * 60 * 60 * 1000 * 1000 + msSinceEpoch * 1000;
-        if (visit.type == itemvisit.type && visit.date == expectedDate) {
-          itemvisit.found = true;
+        if (visit.type == itemvisit.type) {
+          if (itemvisit.date === undefined || visit.date == expectedDate) {
+            itemvisit.found = true;
+          }
         }
       }
     }