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traceback when no devices exist #425

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@pfps

Description

@pfps

Where there are no devices to discover kasa triggers a traceback. A more dignified exit would be preferred.

idefix ~> kasa sysinfo
No host name given, trying discovery..
Discovering devices on 255.255.255.255 for 3 seconds
Traceback (most recent call last):
  File "/home/pfps/.local/bin/kasa", line 8, in <module>
    sys.exit(cli())
             ^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 1157, in __call__
    return anyio.run(self._main, main, args, kwargs, **opts)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/anyio/_core/_eventloop.py", line 70, in run
    return asynclib.run(func, *args, **backend_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 292, in run
    return native_run(wrapper(), debug=debug)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/asyncio/base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/anyio/_backends/_asyncio.py", line 287, in wrapper
    return await func(*args)
           ^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 1160, in _main
    return await main(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 1076, in main
    rv = await self.invoke(ctx)
         ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 1687, in invoke
    return await _process_result(await sub_ctx.command.invoke(sub_ctx))
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 1434, in invoke
    return await ctx.invoke(self.callback, **ctx.params)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/core.py", line 778, in invoke
    rv = __callback(*args, **kwargs)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pfps/.local/lib/python3.11/site-packages/asyncclick/decorators.py", line 78, in new_func
    raise RuntimeError(
RuntimeError: Managed to invoke callback without a context object of type 'SmartDevice' existing.

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