debug: null guard

src/vs/workbench/parts/debug/electron-browser/debugService.ts

@@ -661,7 +661,7 @@ export class DebugService implements debug.IDebugService {
 	public startDebugging(launch: debug.ILaunch, configOrName?: debug.IConfig | string, noDebug = false): TPromise<any> {
 
 		// make sure to save all files and that the configuration is up to date
-		return this.extensionService.activateByEvent('onDebug').then(() => this.textFileService.saveAll().then(() => this.configurationService.reloadConfiguration(launch.workspace).then(() =>
+		return this.extensionService.activateByEvent('onDebug').then(() => this.textFileService.saveAll().then(() => this.configurationService.reloadConfiguration(launch ? launch.workspace : undefined).then(() =>
 			this.extensionService.whenInstalledExtensionsRegistered().then(() => {
 				if (this.model.getProcesses().length === 0) {
 					this.removeReplExpressions();