fix: support incase of channels attribute is missing in component object (#23)

Author: miettal

openems/__main__.py

@@ -70,7 +70,7 @@ def get_channel_list(ctx, edge_id, component_id):
     edge_config = ctx.obj['client'].get_edge_config(edge_id)
 
     component = [v for (k, v) in edge_config['components'].items() if k == component_id][0]
-    for channel in component['channels']:
+    for channel in component.get('channels', []):
         click.echo(click.style(f'{component_id}/{channel}', fg='green'))