Prevents light icons to become totally white

Solves #1567

esphome/nspanel_esphome_core.yaml

@@ -52,6 +52,7 @@ esphome:
     - priority: 600.0  # This is where most sensors are set up.
       then:
         - lambda: |-
+            blueprint_status->publish_state(0);
             std::string s = "${device_name}";
             std::string result;
             bool last_was_underscore = false;
@@ -1400,7 +1401,11 @@ sensor:
     internal: false
     disabled_by_default: false
     filters:
-      - lambda: return (x / 62) * 100.0f;
+      - lambda: |-
+          if (isnan(x) and x>0)
+            return (x / 62) * 100.0f;
+          else
+            return 0;
     on_value:
       then:
         - lambda: |-
@@ -1530,7 +1535,6 @@ sensor:
 
 ##### START - SWITCH CONFIGURATION #####
 switch:
-
   ##### Notification unread #####
   - name: Notification unread
     platform: template