Steps to reproduce:
1. Open user attached project
2. Run the scene
3. Select the ParticleSystem game object
4. Locate ParticleSystem->Emitter script component
5. Check "Override Velocity"
6. Notice that velocity of the particles should match the value in the script, but it still emits out in a sphere
7. Uncheck the Shape Module, and notice that the particle velocities are correctly overridden

Expected result: When 'Shape' Module is checked, EmitParams.velocity should override the value of current velocity

Reproduced in: 2018.2.0a1, 2018.1.0b4, 2017.3.0p2, 2017.2.1p2, 2017.1.3f1, 2017.1.0b2
Not reproduced in: 2017.1.0b1, 5.6.5f1
Regression since: 2017.1.0b2