Fluid Level emitter not giving the correct signal with out filter

To Reproduce

All tests are with a simple network:
Energy source --> energy acceptor --> cable with emiiter + storage bus --> tank

1. Set level emitter to greater than or equal 1 with no filter, then add fluid to the tank

   • no signal is emitted, this is contrary to how the item level emitter works (no filter means anything in the system)

2. set filter to the fluid used and the emitter turns on (as expected)

3. remove filter from emitter, emitter says on (as expected)
   4 remove fluid from tank

   • emitter stays on (bug)
   • same thing happens when the tank is removed vs the fluid removed

Expected behavior

When a Fluid level emitter doesn't have a filter set it should behave like it's item counterpart and count all fluid in the system

Additional context

Test setup:
https://ibb.co/k8j73V
config:
https://ibb.co/hMP4Hq

Environment

• Minecraft Version: 1.12.2
• AE2 Version: rv6-stable-4
• Forge Version: 3770