Fix error when creating reports
Traceback (innermost last):
  Module ZPublisher.Publish, line 70, in publish
  Module ZPublisher.mapply, line 77, in mapply
  Module ZPublisher.Publish, line 48, in call_object
  Module bika.lims.browser.reports, line 246, in __call__
NameError: name 'createPDF' is not defined