[FIX]GOLEM Activity : constraint limitation, handle cases where only start or end date are fixed
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@ -50,7 +50,7 @@ class GolemActivity(models.Model):
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def _check_period(self):
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""" Check if end date if after start date """
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for a in self:
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if a.date_start > a.date_end:
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if a.date_start and a.date_end and a.date_start > a.date_end:
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raise models.ValidationError(_('Start of the period cannot be '
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'after end of the period.'))
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