fix test

Author: wxiaoguang

Diff for: modules/templates/util_date.go

@@ -72,6 +72,8 @@ func timeSinceLegacy(time any, _ ...any) template.HTML {
 
 func anyToTime(any any) (t time.Time, isZero bool) {
 	switch v := any.(type) {
+	case nil:
+		// it is zero
 	case time.Time:
 		t = v
 	case timeutil.TimeStamp:

Diff for: modules/templates/util_date_test.go

@@ -19,7 +19,7 @@ func TestDateTime(t *testing.T) {
 	defer test.MockVariableValue(&setting.DefaultUILocation, testTz)()
 	defer test.MockVariableValue(&setting.IsInTesting, false)()
 
-	du := NewDateUtils(nil)
+	du := NewDateUtils()
 
 	refTimeStr := "2018-01-01T00:00:00Z"
 	refDateStr := "2018-01-01"