Old tango servers don't support the pipe API when used with PyTango v…

…ersions less than 9. Since we don't support pipes yet anyway, we should handle this exception and move on.

src/ophyd_async/tango/signal/_signal.py

@@ -16,7 +16,7 @@
     SignalW,
     SignalX,
 )
-from tango import AttrDataFormat, AttrWriteType, CmdArgType, DeviceProxy, DevState
+from tango import AttrDataFormat, AttrWriteType, CmdArgType, DeviceProxy, DevState, NonSupportedFeature
 from tango.asyncio import DeviceProxy as AsyncDeviceProxy
 
 from ._tango_transport import TangoSignalBackend, get_python_type
@@ -174,8 +174,12 @@ async def infer_signal_type(
     else:
         dev_proxy = proxy
 
-    if tr_name in dev_proxy.get_pipe_list():
-        raise NotImplementedError("Pipes are not supported")
+    try:
+        if tr_name in dev_proxy.get_pipe_list():
+            raise NotImplementedError("Pipes are not supported")
+    except NonSupportedFeature:
+        pass 
+
 
     if tr_name not in dev_proxy.get_attribute_list():
         if tr_name not in dev_proxy.get_command_list():