Strict null check experimentalPrompt

src/tsconfig.strictNullChecks.json

@@ -601,6 +601,8 @@
 		"./vs/workbench/parts/execution/electron-browser/terminal.ts",
 		"./vs/workbench/parts/execution/electron-browser/terminalService.ts",
 		"./vs/workbench/parts/execution/test/electron-browser/terminalService.test.ts",
+		"./vs/workbench/parts/experiments/electron-browser/experimentalPrompt.ts",
+		"./vs/workbench/parts/experiments/electron-browser/experiments.contribution.ts",
 		"./vs/workbench/parts/experiments/node/experimentService.ts",
 		"./vs/workbench/parts/extensions/common/extensionQuery.ts",
 		"./vs/workbench/parts/extensions/common/extensions.ts",

src/vs/workbench/parts/experiments/electron-browser/experimentalPrompt.ts

@@ -51,7 +51,7 @@ export class ExperimentalPrompts extends Disposable implements IWorkbenchContrib
 		};
 
 		const actionProperties = (<IExperimentActionPromptProperties>experiment.action.properties);
-		const promptText = ExperimentalPrompts.getLocalizedText(actionProperties.promptText, language);
+		const promptText = ExperimentalPrompts.getLocalizedText(actionProperties.promptText, language || '');
 		if (!actionProperties || !promptText) {
 			return;
 		}
@@ -60,7 +60,7 @@ export class ExperimentalPrompts extends Disposable implements IWorkbenchContrib
 		}
 
 		const choices: IPromptChoice[] = actionProperties.commands.map((command: IExperimentActionPromptCommand) => {
-			const commandText = ExperimentalPrompts.getLocalizedText(command.text, language);
+			const commandText = ExperimentalPrompts.getLocalizedText(command.text, language || '');
 			return {
 				label: commandText,
 				run: () => {