ISPyB LIMS: raise NotImplementedError

Reise the dedicated 'NotImplementedError' exception if an
'abstract' method is invoked in ISPyBAbstractLIMS class.

This is the established way to deal with 'abstart' method in python.

mxcubecore/HardwareObjects/abstract/ISPyBAbstractLims.py

@@ -86,13 +86,13 @@ def init(self):
                     pass
 
     def get_user_name(self):
-        raise Exception("Abstract class. Not implemented")
+        raise NotImplementedError
 
     def get_full_user_name(self):
-        raise Exception("Abstract class. Not implemented")
+        raise NotImplementedError
 
     def is_user_login_type(self):
-        raise Exception("Abstract class. Not implemented")
+        raise NotImplementedError
 
     def store_beamline_setup(self, session_id, bl_config):
         self.adapter.store_beamline_setup(session_id, bl_config)
@@ -130,7 +130,7 @@ def ldap_login(self, login_name, psd):
         return self.ldapConnection.authenticate(login_name, psd)
 
     def ispyb_login(self, login_name, psd):
-        raise Exception("Abstract class. Not implemented")
+        raise NotImplementedError
 
     def store_data_collection(self, mx_collection, bl_config=None):
         return self._store_data_collection(mx_collection, bl_config)