Reviewers: ,


Please review this at http://codereview.tryton.org/149001/

Affected files:
  M tryton/gui/window/view_form/model/field.py


Index: tryton/gui/window/view_form/model/field.py
===================================================================
--- a/tryton/gui/window/view_form/model/field.py
+++ b/tryton/gui/window/view_form/model/field.py
@@ -845,7 +845,7 @@
                 return ''
             _, filename = tempfile.mkstemp(prefix='tryton_')
             with open(filename, 'wb') as fp:
-                fp.write(values[self.name])
+                fp.write(values[self.name] or '')
             self.set(record, filename)
         return self.get(record)



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