NaN values in telemetry

[quimnut]

A new node had some invalid telemetry today on .328

meshinfo_1 | | File "templates/static/node.html.j2", line 43, in block 'content'
meshinfo_1 | | {{ node.telemetry.temperature | round(1) }}°C
meshinfo_1 | | ^^^^^^^^^^^^^^^^^
meshinfo_1 | | File "/usr/local/lib/python3.12/site-packages/jinja2/filters.py", line 1169, in do_round
meshinfo_1 | | return round(value, precision)
meshinfo_1 | | ^^^^^^^^^^^^^^^^^^^^^^^
meshinfo_1 | | TypeError: type str doesn't define round method

nodes.json had;

"telemetry": {
  "relative_humidity": "NaN",
  "temperature": "NaN"
}

It also ended up in telenetry.json

meshinfo_1 | | File "templates/static/telemetry.html.j2", line 173, in block 'content'
meshinfo_1 | | {{ item.payload.temperature | round(2) }} °C

[kevinelliott]

@quimnut Good report. Yes, confirmed, I'm seeing these too.

[kevinelliott]

@quimnut Do you want to take a stab at this one?

[kevinelliott]

Completed.