"filter_out_message_when " and "expires_after " ignored

[kevinkey619]

Despite the below settings in my weewx.conf, I keep getting random blank pressure values sent to Weather Underground.

[[[indoor/BME280_pressure]]]
# The WeeWX name.
# Default is the name from MQTT.
name = pressure
ignore = false
qos = 1
expires_after = None
filter_out_message_when = 0, None

[bellrichm]

‘filter_out_message_when’ is only valid for json payloads

[bellrichm]

Lets work through your problems in one place, #157