diff --git a/openslides/agenda/migrations/0002_duration.py b/openslides/agenda/migrations/0002_duration.py
index 3c183544f..8ea380bed 100644
--- a/openslides/agenda/migrations/0002_duration.py
+++ b/openslides/agenda/migrations/0002_duration.py
@@ -9,7 +9,6 @@ def convert_duration(apps, schema_editor):
     Item = apps.get_model('agenda', 'item')
     for item in Item.objects.all():
         duration = item.duration
-
         item.duration_tmp = None
         if is_int(duration):
             # assuming that these are minutes
@@ -26,9 +25,10 @@ def convert_duration(apps, schema_editor):
 def is_int(s):
     try:
         int(s)
-        return True
     except ValueError:
         return False
+    else:
+        return True
 
 
 class Migration(migrations.Migration):
diff --git a/openslides/agenda/static/js/agenda/site.js b/openslides/agenda/static/js/agenda/site.js
index 5c9e06eb5..0c458db0f 100644
--- a/openslides/agenda/static/js/agenda/site.js
+++ b/openslides/agenda/static/js/agenda/site.js
@@ -129,7 +129,7 @@ angular.module('OpenSlidesApp.agenda.site', ['OpenSlidesApp.agenda'])
             if (startTime) {
                 var timestamp = Date.parse(startTime) + totalDuration * 60 * 1000;
                 var endDate = new Date(timestamp);
-                var mm = ("0"+endDate.getMinutes()).slice(-2);
+                var mm = ("0" + endDate.getMinutes()).slice(-2);
                 var dateStr = endDate.getHours() + ':' + mm;
                 return dateStr;
             } else {
diff --git a/openslides/core/static/js/core/base.js b/openslides/core/static/js/core/base.js
index 147a03819..8b6438704 100644
--- a/openslides/core/static/js/core/base.js
+++ b/openslides/core/static/js/core/base.js
@@ -433,10 +433,8 @@ angular.module('OpenSlidesApp.core', [
 .filter('osMinutesToTime', [
     function () {
         return function (totalminutes) {
-            if (!totalminutes) {
-                return '';
-            } else {
-                var time = "";
+            var time = '';
+            if (totalminutes) {
                 if (totalminutes < 0) {
                     time = "-";
                     totalminutes = -totalminutes;
@@ -444,10 +442,10 @@ angular.module('OpenSlidesApp.core', [
                 var hh = Math.floor(totalminutes / 60);
                 var mm = Math.floor(totalminutes % 60);
                 // Add leading "0" for double digit values
-                mm = ("0"+mm).slice(-2);
+                mm = ("0" + mm).slice(-2);
                 time += hh + ":" + mm;
-                return time;
             }
+            return time;
         };
     }
 ])