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The event should be skipped only if new_data is null or an empty,
list/object, not if it contains
a zero/false-y value.

This reverts commit f3be4a50.

FIX: Use a separate error handler for the Pushbullet backend that doesn't raise another exception (prevents maximum recursion errors in the logs caused by the interpreter entering an infinite loop of error handlers)

The logic Watchdog applies to filter events based
on `ignore_directories`, `ignore_patterns` and
`ignore_regexes` isn't really sophisticated, and
it doesn't check whether a partial directory/file
name is used in one of the `ignore_*` patterns.
The `file.monitor` backend should therefore implement
this logic on its side.

MQTT client IDs are now generated as a function of
`(client_id, host, port, topics, on_message)` to
prevent client ID clashes.

gunicorn makes it easier to set up a uWSGI wrapper
around the web application, and it's easier to
install and document than handling uwsgi as an
external system dependency.

pychromecast 10.0 introduced some [breaking changes](https://github.com/home-assistant-libs/pychromecast/pull/556/files)
in the declaration of the Chromecast object -
namely, the `device` attribute has been renamed to
`cast_info`. The code of ChromecastPlugin has been
updated to guarantee compatibility in both cases.

Given the new object-oriented design of the LTR559 library, the sensor object should be initialized in __init__ and read upon get_measurement()

Removed pydoc of internal plugin methods that were propagated to the docs of all the derived plugins

Prevent null pointer on music.spotify backend stop if the Librespot process has already been terminated