docs: def get(contract_name):
          '''
          return the contract's ABI, marshaled into python dict
          :param contract_name: string - name of the contract to load
          :return: ABI, None - if successful
                   None, error - if error
          '''
  
          if not Catalog.path:
              return None, "path to catalog must be set before searching it"
          if not contract_name:
              return None, "contract name missing"
  
          abi_file = "{}/{}.abi".format(Catalog.path, contract_name)
  
          try:
              with open(abi_file, "r") as file:
                  abi = file.read()
          except Exception as e:
              return None, "Catalog.get error: {}".format(e)
          return abi, None