Influx1 missing credentials error not handled on write

[andig]

Latest since #109 it should be possible to work against Influx1. I've tried to do so, but without credentials (token is empty):

client := influxdb2.NewClientWithOptions(url, token,
	influxdb2.DefaultOptions().SetFlushInterval(1).SetBatchSize(1).SetLogLevel(3),
)
writer := client.WriteApi(org, bucket)

go func() {
	for err := range m.writer.Errors() {
		m.log.ERROR.Println(err)
	}
}()

This does not generate any errror:

2020/05/06 08:47:05 [D]! Write proc: received write request
2020/05/06 08:47:05 [D]! Writing batch: gridPower,loadpoint=openwb-lp1 value=-5208 1588747625681549000
2020/05/06 08:47:05 [D]! Write proc: received write request
2020/05/06 08:47:05 [D]! Writing batch: pvPower,loadpoint=openwb-lp1 value=-6596 1588747625681587000
2020/05/06 08:47:05 [I]! sending batch
2020/05/06 08:47:05 [D]! Write proc: received write request
2020/05/06 08:47:05 [D]! Writing batch: chargePower,loadpoint=openwb-lp1 value=0 1588747625681638000
2020/05/06 08:47:05 [I]! sending batch

I would have expected an error value even with the async writer as points cannot be written. I did not check if this is handled correctly with Influx2.

Update using a blocking writer doesn't error either:

	if err := m.writer.WritePoint(context.Background(), p); err != nil {
		m.log.ERROR.Println(err)
	}

[vlastahajek]

It looks like your InfuxDB 1 instance is unauthenticated and writes go OK.
If InfluxDB 1 had authentication turned on, you would see an error, despite with an empty message, cause InfluxDB 1 sends error in an incompatible format.

[andig]

thank you- guess I need to double-check :/