Fix traceback when iSCSI service fails to reload

Seen in TrueNAS-11.2-MASTER-201904150659
I used the wizard to set up a TN x10 (I set it to create an iscsi share named "testing")
When it was completing I got the following traceback

Traceback

Environment:

Software Version: TrueNAS-11.2-MASTER-201904150659 (2ba75c445)
Request Method: POST
Request URL: http://10.20.20.32/legacy/system/wizard/

Traceback:
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
42. response = get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _legacy_get_response
249. response = self._get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
178. response = middleware_method(request, callback, callback_args, callback_kwargs)
File "./freenasUI/freeadmin/middleware.py" in process_view
163. return login_required(view_func)(request, *view_args, **view_kwargs)
File "/usr/local/lib/python3.6/site-packages/django/contrib/auth/decorators.py" in _wrapped_view
23. return view_func(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py" in view
68. return self.dispatch(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/formtools/wizard/views.py" in dispatch
248. response = super(WizardView, self).dispatch(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py" in dispatch
88. return handler(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/formtools/wizard/views.py" in post
309. return self.render_done(form, **kwargs)
File "/usr/local/lib/python3.6/site-packages/formtools/wizard/views.py" in render_done
365. done_response = self.done(final_forms.values(), form_dict=final_forms, **kwargs)
File "./freenasUI/system/forms.py" in done
709. obj.delete()
File "./freenasUI/services/models.py" in delete
1045. _("The iSCSI service failed to reload."))

Exception Type: ServiceFailed at /legacy/system/wizard/
Exception Value: The iSCSI service failed to reload.
 

Request information

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