Continuous queries are failing with protobuf error

[jvshahid]

This was reported in a thread on the mailing list

********************************BUG********************************
Database: updatechecks
Query: [select count(distinct(identifier)),key,app,appBuildNum from raw-update-checks group by time(30d),key,app,appBuildNum into counts.keys.apps.appBuildNums.30d_[key]_[app]_[appBuildNum]]
Error: proto: repeated field has nil element. Stacktrace: goroutine 378 [running]:
common.RecoverFunc(0xc233a7adc6, 0xc, 0xc225dafe40, 0xb5, 0x0)
        /home/vagrant/influxdb/src/common/recover.go:13 +0x106
runtime.panic(0x862cc0, 0xc210036390)
        /home/vagrant/bin/go/src/pkg/runtime/panic.c:248 +0x106
wal.(*WAL).AssignSequenceNumbersAndLog(0xc2100de100, 0xc2386a4800, 0x7fedf648ddc0, 0xc21012b380, 0x7fee2a7fac60, ...)
        /home/vagrant/influxdb/src/wal/wal.go:394 +0x10a
cluster.(*ShardData).Write(0xc21012b380, 0xc2386a4800, 0xc21217c830, 0x7fee2071faa8)
        /home/vagrant/influxdb/src/cluster/shard.go:183 +0x96
coordinator.(*CoordinatorImpl).write(0xc2100b4920, 0xc233a7adc6, 0xc, 0xc27719a5e8, 0x1, ...)
        /home/vagrant/influxdb/src/coordinator/coordinator.go:641 +0xb2
coordinator.(*CoordinatorImpl).CommitSeriesData(0xc2100b4920, 0xc233a7adc6, 0xc, 0x7fee2071fd70, 0x1, ...)
        /home/vagrant/influxdb/src/coordinator/coordinator.go:629 +0x8a1
coordinator.(*CoordinatorImpl).InterpolateValuesAndCommit(0xc2100b4920, 0xc225dafe40, 0xb5, 0xc233a7adc6, 0xc, ...)
        /home/vagrant/influxdb/src/c