Description of the issue:

The RF/tick and time to mine a vein of ore are both null for the excavator

Versions & Modlist

1.14.4
Forge 28.2.3
IE 0.14.94
Tested in a pure IE instance

I also spotted this 'null' in the excavator manual in 1.15.2 with ImmersiveEngineering-0.15-108.jar and forge-31.2.31