debug: offer to open launch.json in 'type not supported' message

fixes #21381

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

@@ -586,9 +586,9 @@ export class DebugService implements debug.IDebugService {
 						}
 
 						if (!this.configurationManager.getAdapter(resolvedConfig.type)) {
-							return resolvedConfig.type ? TPromise.wrapError(new Error(nls.localize('debugTypeNotSupported', "Configured debug type '{0}' is not supported.", resolvedConfig.type)))
-								: TPromise.wrapError(errors.create(nls.localize('debugTypeMissing', "Missing property 'type' for the chosen launch configuration."),
-									{ actions: [this.instantiationService.createInstance(debugactions.ConfigureAction, debugactions.ConfigureAction.ID, debugactions.ConfigureAction.LABEL), CloseAction] }));
+							const message = resolvedConfig.type ? nls.localize('debugTypeNotSupported', "Configured debug type '{0}' is not supported.", resolvedConfig.type) :
+								nls.localize('debugTypeMissing', "Missing property 'type' for the chosen launch configuration.");
+							return TPromise.wrapError(errors.create(message, { actions: [this.instantiationService.createInstance(debugactions.ConfigureAction, debugactions.ConfigureAction.ID, debugactions.ConfigureAction.LABEL), CloseAction] }));
 						}
 
 						return this.runPreLaunchTask(resolvedConfig.preLaunchTask).then((taskSummary: ITaskSummary) => {