Duplicate error messages after processing all the validator plugins

[slopjong]

Arrays lead to duplicate error messages.

Example:

Invalid value(s) for 'sensors.temperature.unit', allowed values are: °C, °F, K, °De, °N, °Ré, °Rø
Property 'sensors.temperature[0].location' is missing.
Invalid value(s) for 'sensors.temperature.unit', allowed values are: °C, °F, K, °De, °N, °Ré, °Rø
Property 'sensors.temperature[1].location' is missing.
Invalid value(s) for 'sensors.barometer.unit', allowed values are: hPA
Property 'sensors.barometer[0].location' is missing.
Property 'sensors.humidity[0].unit' is missing.
Property 'sensors.humidity[0].location' is missing.
Property 'sensors.humidity[1].unit' is missing.
Property 'sensors.humidity[1].location' is missing.
Property 'sensors.wind[0].properties' is missing.
Property 'sensors.wind[0].location' is missing.

[slopjong]

The solution is to replace [0] with [] and then make the array elements uniq.

[slopjong]

The previous commentor didn't consider that it makes sense to tell the user what sensor instance is falsy. If the number of lines should be reduced then sum the error messages up as shown here:

Property 'sensors.humidity[].unit' is missing. Check sensor instance #1, #2 and #3.