Safer lookup of description_placeholders when service is invalid (#28273)

Author: karwosts

src/components/ha-service-control.ts

@@ -467,7 +467,7 @@ export class HaServiceControl extends LitElement {
 
     const descriptionPlaceholders =
       domain && serviceName
-        ? this.hass.services[domain][serviceName].description_placeholders
+        ? this.hass.services[domain]?.[serviceName]?.description_placeholders
         : undefined;
 
     const description =

src/panels/developer-tools/action/developer-tools-action.ts

@@ -137,7 +137,7 @@ class HaPanelDevAction extends LitElement {
 
     const descriptionPlaceholders =
       domain && serviceName
-        ? this.hass.services[domain][serviceName].description_placeholders
+        ? this.hass.services[domain]?.[serviceName]?.description_placeholders
         : undefined;
 
     return html`