Steps to reproduce:
1. Open attached project
2. Press on "Error" material

Expected result: Console gives no errors.
Actual result: Console prints 3 errors.

Reproduced in: 2018.3.0b6, 2019.1.0a4

Note:
1. Reproduces with 4.0.1, 4.0.0 versions.
2. Errors disappear if you manually add DetailNormalMap, DetailAlbedoMap, ParallaxMap parameters in Lit.shader.
3. Could not test in 2018.2 and lower, because those versions don't have 4.0.1, 4.0.0 versions of LWRP package.