[Bug] No graph generated with negative-y transform

[yellowpattern]

Grafana Version: 4.4.2
Data source: Influxdb 1.3.2

When using "negative y" transform to alter how a series is presented, a series can completely disappear:

If I take away the negative transform, the graph returns:

[yellowpattern]

Forgot this screenshot

[torkelo]

do you have any min/max settings defined in Y-Axis options ?

[yellowpattern]

No. I tried that (-100/1000) to see if would help but it did not.

[torkelo]

strange, unable to replicate it here, the graph shows fine

[yellowpattern]

Attaching the a sample of the panel when "broken"
BUG9280-1505730103431.txt

[torkelo]

Ah, you have a logarithmic scale on your axis, this does not support negative values
#7627