fix(#121): fix for hidden error msg

src/chart.ts

@@ -33,6 +33,7 @@ export class Chart extends LitElement {
  @state() private highlightedEntities: EntityConfigInternal[] = [];
  @state() private lastUpdate = 0;
  @state() public zoomEntity?: EntityConfigInternal;
+ @state() public error?: Error;
 
  // https://lit.dev/docs/components/lifecycle/#reactive-update-cycle-performing
  protected shouldUpdate(changedProps: PropertyValues): boolean {
@@ -86,7 +87,8 @@ export class Chart extends LitElement {
  ent.children.forEach(childId => {
  const child = this.config.sections[sectionIndex + 1]?.entities.find(e => e.entity_id === childId);
  if (!child) {
- throw new Error(localize('common.missing_child') + ' ' + childId);
+ this.error = new Error(localize('common.missing_child') + ' ' + childId);
+ throw this.error;
  }
  const connection: ConnectionState = {
  parent: ent,
@@ -447,6 +449,9 @@ export class Chart extends LitElement {
  // https://lit.dev/docs/components/rendering/
  protected render(): TemplateResult | void {
  try {
+ if (this.error) {
+ throw this.error;
+ }
  this.entityStates.clear();
  const containerClasses = classMap({
  container: true,