Start with no state, instead of empty object state

src/vs/workbench/contrib/webview/browser/webviewEditorInput.ts

@@ -82,7 +82,7 @@ export class WebviewEditorInput extends EditorInput {
 		public readonly viewType: string,
 		name: string,
 		options: WebviewInputOptions,
-		state: string,
+		state: string | undefined,
 		events: WebviewEvents,
 		extension: undefined | {
 			readonly location: URI;
@@ -300,7 +300,7 @@ export class RevivedWebviewEditorInput extends WebviewEditorInput {
 		viewType: string,
 		name: string,
 		options: WebviewInputOptions,
-		state: string,
+		state: string | undefined,
 		events: WebviewEvents,
 		extension: undefined | {
 			readonly location: URI;

src/vs/workbench/contrib/webview/browser/webviewEditorService.ts

@@ -146,7 +146,7 @@ export class WebviewEditorService implements IWebviewEditorService {
 		},
 		events: WebviewEvents
 	): WebviewEditorInput {
-		const webviewInput = this._instantiationService.createInstance(WebviewEditorInput, id, viewType, title, options, {}, events, extension);
+		const webviewInput = this._instantiationService.createInstance(WebviewEditorInput, id, viewType, title, options, undefined, events, extension);
 		this._editorService.openEditor(webviewInput, { pinned: true, preserveFocus: showOptions.preserveFocus }, showOptions.group);
 		return webviewInput;
 	}