修正了String类型的为null的时候对外的数据统一返回""字符串

modules/mogo-module-main/src/main/java/com/mogo/module/main/cards/MogoModulesManager.java

@@ -358,6 +358,7 @@ public class MogoModulesManager implements MogoModulesHandler,
             try {
                 getApplicationContext().unregisterReceiver( mReceiver );
             } catch ( Exception e ) {
+                e.printStackTrace();
             }
         }
         mReceiver = null;