mysql同步至clickhouse，日志出现空指针错误后，数据同步被中断

[Allen0769]

Version:

• Bifrost Version: v2.0.6-beta
• Os Version: CentOS 7
  mysql同步至clickhouse的任务中，日志出现空指针错误后，主界面binlog的EventID和position不再刷新，实际数据同步也被中断，但ConnStatus依然是running状态

具体异常日志如下：
2023/07/12 07:22:55 channelConsume err: runtime error: invalid memory address or nil pointer dereference goroutine 149 [running]: runtime/debug.Stack() /usr/local/go/src/runtime/debug/stack.go:24 +0x65 github.com/brokercap/Bifrost/server.(*Channel).channelConsume.func1() /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel.go:133 +0x45 panic({0x10c00c0, 0x1be4000}) /usr/local/go/src/runtime/panic.go:884 +0x213 github.com/brokercap/Bifrost/server.(*consume_channel_obj).sendToServerResult(0xc0000d2f68, 0xc000146160, 0xc00097f930) /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel_consume.go:121 +0x465 github.com/brokercap/Bifrost/server.(*consume_channel_obj).sendToServerList0(0xc0000d2f68?, {0xc000012590, 0x1, 0xc0000d2de0?}, 0xc00097f930) /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel_consume.go:307 +0xa9 github.com/brokercap/Bifrost/server.(*consume_channel_obj).sendToServerList(0xc0000d2f68, {0xc005208900?, 0x0?}, 0xc00097f930, 0x1, 0x2d9) /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel_consume.go:264 +0xab github.com/brokercap/Bifrost/server.(*consume_channel_obj).consumeChannel(0xc0000d2f68) /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel_consume.go:219 +0x3a9 github.com/brokercap/Bifrost/server.(*Channel).channelConsume(0xc000300480) /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel.go:139 +0xad created by github.com/brokercap/Bifrost/server.(*Channel).Start /mnt/hgfs/gopath/src/github.com/brokercap/Bifrost/server/channel.go:91 +0x1b2