code: def getAvailableInstruments(self):
          
          instruments = self.getInstruments() \
              if self.getInstrumentEntryOfResults() is True \
              else None
          return instruments if instruments else []
docs: Returns the instruments available for this service.
              If the service has the getInstrumentEntryOfResults(), returns
              the instruments capable to perform this service. Otherwhise,
              returns an empty list.