Fix bug when no main method (#290)

Author: CsCherrYY

src/exportJarSteps/ResolveMainMethodExecutor.ts

@@ -46,6 +46,7 @@ export class ResolveMainMethodExecutor implements IExportJarStepExecutor {
         }
         const noMainClassItem: IJarQuickPickItem = {
             label: "<without main class>",
+            description: "",
         };
         pickItems.push(noMainClassItem);
         const disposables: Disposable[] = [];

src/exportJarSteps/utility.ts

@@ -2,7 +2,6 @@
 // Licensed under the MIT license.
 
 import { QuickInputButtons, QuickPick, QuickPickItem, window } from "vscode";
-import { IExportJarStepExecutor } from "./IExportJarStepExecutor";
 
 export interface IJarQuickPickItem extends QuickPickItem {
     uri?: string;