Openweather node question - how to filter outputs

[Trying_to_learn]

Folks, I'm confused.

I have my openweather node and see it's output.

I am interested in the rain output.

If it isn't raining, I'm stuck how to filter the message.

Example/s:
No rain:

{"_msgid":"02bbdb546cecd8f5","payload":{"id":804,"weather":"Clouds","detail":"overcast clouds","icon":"04d","tempk":288.3,"tempc":15.1,"temp_maxc":15.1,"temp_minc":15.1,"humidity":87,"pressure":1017,"maxtemp":288.3,"mintemp":288.3,"windspeed":0.83,"winddirection":128,"location":"Cooma","sunrise":1677786638,"sunset":1677832851,"clouds":100,"description":"The weather in Cooma at coordinates: -36.2333, 149.1333 is Clouds (overcast clouds)."},"topic":"","icon":"<i class=\"fa fa-refresh fa-spin\"></i>","background":"#333333","font":"red","location":{"lon":149.1333,"lat":-36.2333,"city":"Cooma","country":"AU"},"data":{"coord":{"lon":149.1333,"lat":-36.2333},"weather":[{"id":804,"main":"Clouds","description":"overcast clouds","icon":"04d"}],"base":"stations","main":{"temp":288.3,"feels_like":288.14,"temp_min":288.3,"temp_max":288.3,"pressure":1017,"humidity":87,"sea_level":1017,"grnd_level":926},"visibility":10000,"wind":{"speed":0.83,"deg":128,"gust":1.36},"clouds":{"all":100},"dt":1677792992,"sys":{"country":"AU","sunrise":1677786638,"sunset":1677832851},"timezone":39600,"id":2170577,"name":"Cooma","cod":200},"time":"2023-03-02T21:36:32.000Z","title":"Current Weather Information","description":"Current weather information at coordinates: -36.2333, 149.1333"}

Rain:

{"_msgid":"400e17eaad85a668","payload":{"id":500,"weather":"Rain","detail":"light rain","icon":"10d","tempk":293.15,"tempc":20,"temp_maxc":21.7,"temp_minc":18.7,"humidity":89,"pressure":1016,"maxtemp":294.87,"mintemp":291.85,"windspeed":3.09,"winddirection":200,"location":"Ashfield","sunrise":1677786271,"sunset":1677832260,"clouds":75,"rain":0.87,"description":"The weather in Ashfield at coordinates: -33.8886, 151.1314 is Rain (light rain)."},"topic":"","location":{"lon":151.1314,"lat":-33.8886,"city":"Ashfield","country":"AU"},"data":{"coord":{"lon":151.1314,"lat":-33.8886},"weather":[{"id":500,"main":"Rain","description":"light rain","icon":"10d"}],"base":"stations","main":{"temp":293.15,"feels_like":293.53,"temp_min":291.85,"temp_max":294.87,"pressure":1016,"humidity":89},"visibility":10000,"wind":{"speed":3.09,"deg":200},"rain":{"1h":0.87},"clouds":{"all":75},"dt":1677792601,"sys":{"type":2,"id":2010638,"country":"AU","sunrise":1677786271,"sunset":1677832260},"timezone":39600,"id":7839683,"name":"Ashfield","cod":200},"time":"2023-03-02T21:30:01.000Z","title":"Current Weather Information","description":"Current weather information at coordinates: -33.8886, 151.1314"}

What I am looking at:

And so you see this rain property.

Just after the openweather node I have a switch node.
(code below)

But that won't work if the rain property isn't there.
So I have the switch node set to this:

IS NOT EMPTY

But that doesn't pass the payload if/when it is raining.

Below is the modified code that works now - while it is raining.
But what's going to happen when it isn't raining?

I fear an error will happen.

The node is basically set to > 0 - to save you importing the node.
(Sorry)

[{"id":"19a82bda1a7ebdf3","type":"switch","z":"05319bbbba06da29","name":"Raining?","property":"data.rain[\"1h\"]","propertyType":"msg","rules":[{"t":"gt","v":"0","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":655,"y":310,"wires":[["2fdfdb709240ab4e","bbf430450a163bba"]],"l":false}]

[jbudd]

I stopped using the OpenWeatherMap node. can't recall exactly why, but I wanted some data that's available in their OneCall API but not in the API accessed with the node.

Anyway, I see similar behaviour:
The forecast for next Tuesday, msg.payload.daily[5] has a property rainmm = "3mm" ,
but for tomorrow msg.payload.daily[1].rainmm does not exist.

I copy the values into a dashboard template. Here's a snippet

<div class="icon">
       <div class="subtitle time">{{msg.payload.daily[2].day}}</div>
       <i class="wi wi-owm-{{msg.payload.daily[2].weather[0].icon}}" style="{{msg.payload.daily[2].iconstyle}}"></i>
       <div class="subtitle temp">{{msg.payload.daily[2].temp.max | number:0}}°</div>
       <div class="subtitle rain">{{msg.payload.daily[2].rainmm}}</div>
       <div class="subtitle snow">{{msg.payload.daily[2].snowmm}}</div>
       <div class="subtitle wind">{{msg.payload.daily[2].strongwind}}</div>
 </div>  

It does not give either errors or warnings if those properties don't exist. A debug node set to show payload.daily[2].rainmm gives undefined.

[Trying_to_learn]

Thanks, but I fear the meaning for what I was asking was lost in how I asked it.

I do NOT use the forecast function/feature.
Anyway, I'll rephrase the question in a new thread.