节点发生分叉后， 分叉块写入mongo 有问题。

[Allen-yan]

每次只要节点上看到分叉相关信息
14:16:45.973 WARN [TronJClientWorker-15] [DB](Manager.java:1087) switch fork! new head num = 23415266, blockid = 00000000016549e27dc26a3fb00bb0eb766a1a2e81b466aefe0707f9dfbe907b
改块就不会被写入mongo
db.block.find({blockNumber:23415266})为空