[0.9.4] submitting empty write payload causes panic with index out of range

[newtoncorp]

Similar to #4735 different stack trace, in a write query.

2015/11/12 16:39:56 http: panic serving 10.42.5.20:53319: runtime error: index out of range
goroutine 42218 [running]:
net/http.(*conn).serve.func1(0xc8200d3b80, 0x7f9c0a722f30, 0xc820020e10)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1287 +0xb5
github.com/influxdb/influxdb/services/httpd.(*Handler).serveWriteLine(0xc82007d280, 0x7f9c0a7496f0, 0xc82013aca0, 0xc8205228c0, 0xc820111c00, 0x1, 0x200, 0x0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:458 +0x1384
github.com/influxdb/influxdb/services/httpd.(*Handler).serveWrite(0xc82007d280, 0x7f9c0a7496f0, 0xc82013aca0, 0xc8205228c0, 0x0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:376 +0x79c
github.com/influxdb/influxdb/services/httpd.(*Handler).(github.com/influxdb/influxdb/services/httpd.serveWrite)-fm(0x7f9c0a7496f0, 0xc82013aca0, 0xc8205228c0, 0x0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:106 +0x48
github.com/influxdb/influxdb/services/httpd.authenticate.func1(0x7f9c0a7496f0, 0xc82013aca0, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:673 +0x70
net/http.HandlerFunc.ServeHTTP(0xc820131c20, 0x7f9c0a7496f0, 0xc82013aca0, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.gzipFilter.func1(0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:734 +0x2af
net/http.HandlerFunc.ServeHTTP(0xc820131c40, 0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.versionHeader.func1(0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:743 +0xc0
net/http.HandlerFunc.ServeHTTP(0xc820131c60, 0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.cors.func1(0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:776 +0x328
net/http.HandlerFunc.ServeHTTP(0xc820131c80, 0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.requestID.func1(0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:786 +0x15d
net/http.HandlerFunc.ServeHTTP(0xc820131ca0, 0x7f9c0a749618, 0xc82013ac20, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.logging.func1(0x7f9c0a749618, 0xc82013ab80, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:794 +0x10b
net/http.HandlerFunc.ServeHTTP(0xc820131cc0, 0x7f9c0a749618, 0xc82013ab80, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/influxdb/influxdb/services/httpd.recovery.func1(0x7f9c0a7495e0, 0xc8200ba160, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:804 +0x114
net/http.HandlerFunc.ServeHTTP(0xc820131ce0, 0x7f9c0a7495e0, 0xc8200ba160, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1422 +0x3a
github.com/bmizerany/pat.(*PatternServeMux).ServeHTTP(0xc820020110, 0x7f9c0a7495e0, 0xc8200ba160, 0xc8205228c0)
        /tmp/build/src/github.com/bmizerany/pat/mux.go:109 +0x244
github.com/influxdb/influxdb/services/httpd.(*Handler).ServeHTTP(0xc82007d280, 0x7f9c0a7495e0, 0xc8200ba160, 0xc8205228c0)
        /tmp/build/src/github.com/influxdb/influxdb/services/httpd/handler.go:172 +0x357
net/http.serverHandler.ServeHTTP(0xc82017e5a0, 0x7f9c0a7495e0, 0xc8200ba160, 0xc8205228c0)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1862 +0x19e
net/http.(*conn).serve(0xc8200d3b80)
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1361 +0xbee
created by net/http.(*Server).Serve
        /home/philip/.gvm/gos/go1.5/src/net/http/server.go:1910 +0x3f6

Reproduced 100% by writing an empty array of points with the python influxdb client

from influxdb import InfluxDBClient
client = InfluxDBClient("xxx", 8086, "xxx", "xxx", "xxx")
influx_client.write_points([])

[oiooj]

Already fixed in 0.9.5 #4625