#241: Remove init from ICAT backend

- This is no longer used (was used for client handling previously before the object-pool-cache design was implemented)

datagateway_api/common/icat/backend.py

@@ -34,9 +34,6 @@ class PythonICATBackend(Backend):
     Class that contains functions to access and modify data in an ICAT database directly
     """
 
-    def __init__(self):
-        pass
-
     def login(self, credentials, **kwargs):
         log.info("Logging in to get session ID")
         client_pool = kwargs.get("client_pool")