send instrument='n_a' if not available

instead of null

+ remove another debugging print statement

secop.py

@@ -73,7 +73,6 @@ class SecopInteractor(SecopClient):
                 component['info'] = info
             component['name'] = f'{name}:value'
             component['title'] = name
-            print(component)
             components.append(component)
         self.param_updates.add('value')
         self.param_updates.add('status')

webserver.py

@@ -147,7 +147,7 @@ def get_update(_=None):
         logging.info('UPDATE %s %s', client.id, socket.getfqdn(flask.request.remote_addr.split(':')[-1]))
         # msg = dict(type='id', id=client.id, title=instrument.title);
         # yield to_json_sse(msg)
-        msg = dict(type='id', id=client.id, instrument=kwargs.get('instrument', '<unknown>'),
+        msg = dict(type='id', id=client.id, instrument=kwargs.get('instrument') or 'n_a',
                    device=client.device_name)
         yield to_json_sse(msg)
         try: