Merge branch 'develop' into 'master'

Fix kaehmy form error

See merge request !61

webapp/forms.py

@@ -43,7 +43,7 @@ class KaehmyForm_Form(forms.ModelForm):
     def clean_custom_role_name(self):
         """Check that no other custom role with same name exists."""
         custom_name = self.cleaned_data.get('custom_role_name')
-        if CustomKaehmyRole.objects.get(name=custom_name) is None:
+        if not CustomKaehmyRole.objects.filter(name=custom_name).exists():
             return custom_name
         else:
             raise ValidationError(_('Custom role with the same name already exists.'))