Update weather-display.md

I had some real trouble today when some sensors went offline... here's how to error-check in Home Assistant!
lubeda · Feb 25, 2024 · 96a02cc · 96a02cc
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diff --git a/wiki/weather-display.md b/wiki/weather-display.md
@@ -111,3 +111,15 @@ action:
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           b: 192
 ```
+
+### How to add error-checking to sensors which may go offline (and cause the script to abort)
+
+```
+          text: >
+            {% set state = states('sensor.openweathermap_temperature') %} {% if
+            is_number(state) %}
+              {{ state|round(1) }}°
+            {% else %}
+              {{ "error" }}
+            {% endif %}
+```