docs: def preprocess(self):
          """Preprocessing.
  
          Each active custom field is given a 'name' key that holds the field
          name, and for each keyed name, the value of the custom field is
          assigned.
  
          Notes on the group get some html tags removed.
          """
          super(MambuLoan,self).preprocess()
  
          try:
              self['notes'] = strip_tags(self['notes'])
          except KeyError:
              pass