Apparent crash on delete of share to invalid directory

Here's how I got to this crash:

* I disenabled the share BigDataShare.

* I deleted the Dataset BigDataShare pointed to, so that /mnt/ScarVol/BigDataSet was no longer valid. (The two shares below it show valid paths.)

* Then I tried to delete the BigDataShare. This gives the "unshare" dialog seen below (although the share was already disenabled - I did that first.)

* Crash:

Error: Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/smb.py", line 1089, in _delete
    await self._sharesec(action='--delete', share=share)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/smb.py", line 1076, in _sharesec
    raise CallError(f'sharesec {action} failed with error: {sharesec.stderr.decode()}')
middlewared.service_exception.CallError: [EFAULT] sharesec --delete failed with error: Invalid sharename: BigDataShare

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 130, in call_method
    io_thread=False)
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1084, in _call
    return await methodobj(*args)
  File "/usr/local/lib/python3.7/site-packages/middlewared/service.py", line 409, in delete
    f'{self._config.namespace}.delete', self, self.do_delete, [id] + list(args)
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1084, in _call
    return await methodobj(*args)
  File "/usr/local/lib/python3.7/site-packages/middlewared/schema.py", line 961, in nf
    return await f(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/smb.py", line 847, in do_delete
    await self.middleware.call('smb.sharesec._delete', share['name'] if not share['home'] else 'homes')
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1141, in call
    app=app, pipes=pipes, job_on_progress_cb=job_on_progress_cb, io_thread=True,
  File "/usr/local/lib/python3.7/site-packages/middlewared/main.py", line 1084, in _call
    return await methodobj(*args)
  File "/usr/local/lib/python3.7/site-packages/middlewared/plugins/smb.py", line 1092, in _delete
    raise CallError(e)
middlewared.service_exception.CallError: [EFAULT] [EFAULT] sharesec --delete failed with error: Invalid sharename: BigDataShare

* The reason I think this bug is low impact is that the operation does actually succeed - see final screenshot.