Add extra checks to duration filter.

syweb/webclient/app-filter.js

@@ -26,6 +26,9 @@ angular.module('matrixWebClient')
         var h = parseInt(t / (60 * 60)) % 24;
         var d = parseInt(t / (60 * 60 * 24));
         if (t < 60) {
+            if (t < 0) {
+                return "0s";
+            }
             return s + "s";
         }
         if (t < 60 * 60) {

syweb/webclient/test/unit/filters.spec.js

@@ -285,6 +285,11 @@ describe('duration filter', function() {
         var output = durationFilter(1000*60*60*2 + 1000*60*35);
         expect(output).toEqual("2h");
     });
+    
+    it("should represent -ve numbers as '0s'", function() {
+        var output = durationFilter(-2000);
+        expect(output).toEqual("0s");
+    });
 });
 
 describe('orderMembersList filter', function() {