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Backend errors when restarting components after stopping

This is because we receive messages through topics which causes errors from Proxy calls which aren't caught.

-! 03/17/23 11:19:48.138 --Ice.Config=/home/ubuntu/code/armarx_config/default.cfg: warning: dispatch exception: src/Util.cpp:349: ::Ice::UnknownException:
   unknown exception:
   Traceback (most recent call last):
     File "/home/ubuntu/implementation/backend/remote/ice.py", line 346, in get_tab  
       values: Dict[str, Any] = self.proxy.getValues(tab)
                                ^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/home/ubuntu/implementation/ArmarXGui_interface_RemoteGuiInterface_ice.py", line 1321, in getValues   
       return _M_armarx.RemoteGuiInterface._op_getValues.invoke(self, ((tab, ), context))
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   Ice.ConnectionRefusedException: Ice.ConnectionRefusedException:
   Connection refused

   The above exception was the direct cause of the following exception:

   Traceback (most recent call last):
     File "/home/ubuntu/code/tools/python/3.11/install/lib/python3.11/site-packages/Ice/__init__.py", line 408, in _iceDispatch
       result = method(*args)
                ^^^^^^^^^^^^^
     File "/home/ubuntu/implementation/backend/remote/ice.py", line 278, in reportTabChanged
       self.service.core.update_tab(tab)
     File "/home/ubuntu/code/tools/python/3.11/install/lib/python3.11/site-packages/typeguard/__init__.py", line 1033, in wrapper
       retval = func(*args, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^
     File "/home/ubuntu/implementation/backend/remote/core.py", line 215, in update_tab
       self.tabs[tab] = self.service.controller.get_tab(tab)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File "/home/ubuntu/implementation/backend/remote/ice.py", line 345, in get_tab
       with IceRequest():
     File "/home/ubuntu/implementation/backend/ice.py", line 18, in __exit__
       raise ProxyUnreachableException(exc_value) from exc_value
   backend.exceptions.ProxyUnreachableException: Ice.ConnectionRefusedException:
   Connection refused

   identity: F76EDDE0-B097-42CB-9192-11EC190CA8EF
   facet:
   operation: reportTabChanged   
   remote host: ::ffff:10.0.3.52 remote port: 39126