@@ -54,5 +54,5 @@ class AssignmentForm(forms.ModelForm):
]
def clean_period_ends(self):
if 'period_begins' in cleaned_data and 'period_ends' in cleaned_data and cleaned_data['period_begins'] > cleaned_data['period_ends']:
if 'period_begins' in self.cleaned_data and 'period_ends' in self.cleaned_data and self.cleaned_data['period_begins'] and self.cleaned_data['period_ends'] and self.cleaned_data['period_begins'] > self.cleaned_data['period_ends']:
raise ValidationError('End of period is before start')