backoffice: don't fail on None value in ods export (#7057)
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@ -94,6 +94,8 @@ class WorkSheet(object):
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class WorkCell(object):
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def __init__(self, worksheet, value, hint=None):
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if value is None:
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value = ''
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if type(value) is not unicode:
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value = unicode(value, 'utf-8')
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self.value = value
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