Show error when media_player is not media_player

lib/cards/media_control_card.dart

@@ -13,6 +13,14 @@ class MediaControlsCard extends StatelessWidget {
         child: MissedEntityWidget(),
         handleTap: false,
       );
+    } else if (card.entity.entity.domain == null || card.entity.entity.domain != 'media_player') {
+      return EntityModel(
+        entityWrapper: card.entity,
+        child: ErrorEntityWidget(
+          text: '${card.entity.entity?.entityId} is not a media_player',
+        ),
+        handleTap: false,
+      );
     }
     return CardWrapper(
         child: EntityModel(

lib/entities/entity.class.dart

@@ -148,7 +148,7 @@ class Entity {
 
   void update(Map rawData, String webHost) {
     attributes = rawData["attributes"] ?? {};
-    domain = rawData["entity_id"].split(".")[0];
+    domain = rawData["entity_id"] != null ? rawData["entity_id"].split(".")[0] : null;
     entityId = rawData["entity_id"];
     deviceClass = attributes["device_class"];
     state = rawData["state"] is bool ? (rawData["state"] ? EntityState.on : EntityState.off) : rawData["state"];

lib/entities/error_entity_widget.dart

@@ -0,0 +1,23 @@
+part of '../main.dart';
+
+class ErrorEntityWidget extends StatelessWidget {
+  
+  final String text;
+
+  ErrorEntityWidget({
+    Key key, this.text
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    final EntityModel entityModel = EntityModel.of(context);
+    String errorText = text ?? "Entity error: ${entityModel.entityWrapper.entity?.entityId}";
+    return Container(
+        child: Padding(
+          padding: EdgeInsets.all(5.0),
+          child: Text(errorText),
+        ),
+        color: Theme.of(context).errorColor,
+    );
+  }
+}

lib/main.dart

@@ -100,6 +100,7 @@ part 'entities/alarm_control_panel/widgets/alarm_control_panel_controls.widget.d
 part 'entities/vacuum/vacuum_entity.class.dart';
 part 'entities/vacuum/widgets/vacuum_controls.dart';
 part 'entities/vacuum/widgets/vacuum_state_button.dart';
+part 'entities/error_entity_widget.dart';
 part 'pages/settings/connection_settings.part.dart';
 part 'pages/purchase.page.dart';
 part 'pages/widgets/product_purchase.widget.dart';