code: def tmpl_ifdefnotempty(self, field, trueval=u'', falseval=u''):
          
          if field not in self.values or \
             (field in self.values and not self.values[field]) or \
             re.search(r'^\s*$', self.values[field]):
              return falseval
          else:
              return trueval
docs: If field is not emtpy return trueval or the field (default)
          otherwise, emit return falseval (if provided).
  
          * synopsis: ``%ifdefnotempty{field,text}`` or \
              ``%ifdefnotempty{field,text,falsetext}``
          * description: If field is not empty, then return truetext. \
              Otherwise, returns falsetext. The field should be \
              entered without $.
  
          :param field: The name of the field
          :param trueval: The string if the condition is true
          :param falseval: The string if the condition is false
          :return: The string, based on condition