How to reproduce:
1. Open user attached project.
2. Open 'main' scene
3. Select 'Particle System' from Hierarchy.
4. Notice 'normal' behaviour.
5. Enable '2ndLightCausingProblemswithParticleSystemUsingAnAlbedoShader' light from hierarchy.
6. Notice Particle System bleeds white color in high activity areas (middle of particle system).

Expected behaviour: Number of light sources not affecting the behaviour of a shader.
Actual behaviour: Shader bleeds white if more than one light is used to illuminate it.

Reproduced on: 5.2.4.f1, 5.3.5f1, 5.3.6p3, 5.4.0p2, 5.5.0a6, 5.5.0b1.