增加的字段的get方法中，缺少判空逻辑，造成json解析空指针问题修复

fun-common-vo/src/main/java/com/ctrip/fun/common/vo/basic/VoucherShareLogBean.java

@@ -106,8 +106,11 @@ public class VoucherShareLogBean implements Serializable {
 	}
 	
 	public int getVoucherAmount() {
-		String[] vIds = voucherIds.split(",");
-		return vIds.length;
+		if(voucherIds!=null){
+			String[] vIds = voucherIds.split(",");
+			return vIds.length;
+		}
+		return 0;
 	}
 
 	public int getSharedVoucherAmount() {