Handle (invalid) null hass objects.

src/card-controller/message-manager.ts

@@ -1,4 +1,4 @@
-import { FrigateCardError, MESSAGE_TYPE_PRIORITIES, Message } from '../types';
+import { FrigateCardError, MESSAGE_TYPE_PRIORITIES, Message, MessageType } from '../types';
 import { errorToConsole } from '../utils/basic';
 import { CardMessageAPI } from './types';
 
@@ -31,6 +31,12 @@ export class MessageManager {
     }
   }
 
+  public resetType(type: MessageType): void {
+    if (this._message?.type === type) {
+      this.reset();
+    }
+  }
+
   public setErrorIfHigherPriority(error: unknown): void {
     // This object should accept unknown objects to be able to seamlessly
     // process arguments to catch() which can only be unknown/any.