fix gpg expired bug when time is zero (#3584)

modules/util/time_stamp.go

@@ -59,3 +59,8 @@ func (ts TimeStamp) FormatLong() string {
 func (ts TimeStamp) FormatShort() string {
 	return ts.Format("Jan 02, 2006")
 }
+
+// IsZero is zero time
+func (ts TimeStamp) IsZero() bool {
+	return ts.AsTime().IsZero()
+}

templates/user/settings/keys_gpg.tmpl

@@ -26,7 +26,7 @@
 					<div class="activity meta">
 						<i>{{$.i18n.Tr "settings.add_on"}} <span>{{.AddedUnix.FormatShort}}</span></i>
 						-
-						<i>{{if .ExpiredUnix}}{{$.i18n.Tr "settings.valid_until"}} <span>{{.ExpiredUnix.FormatShort}}</span>{{else}}{{$.i18n.Tr "settings.valid_forever"}}{{end}}</i>
+						<i>{{if not .ExpiredUnix.IsZero}}{{$.i18n.Tr "settings.valid_until"}} <span>{{.ExpiredUnix.FormatShort}}</span>{{else}}{{$.i18n.Tr "settings.valid_forever"}}{{end}}</i>
 					</div>
 				</div>
 			</div>