[Fix]修复runCtaTrading潜在编码错误的问题

examples/CtaTrading/runCtaTrading.py

@@ -1,5 +1,9 @@
 # encoding: UTF-8
 
+import sys
+reload(sys)
+sys.setdefaultencoding('utf8')
+
 import multiprocessing
 from time import sleep
 from datetime import datetime, time

vnpy/trader/uiMainWindow.py

@@ -112,6 +112,10 @@ class MainWindow(QtWidgets.QMainWindow):
         appMenu = menubar.addMenu(vtText.APPLICATION)
         
         for appDetail in self.appDetailList:
+            # 如果没有应用界面，则不添加菜单按钮
+            if not appDetail['appWidget']:
+                continue
+            
             function = self.createOpenAppFunction(appDetail)
             action = self.createAction(appDetail['appDisplayName'], function, loadIconPath(appDetail['appIco']))
             appMenu.addAction(action)