[Stepper] Step header is still in error when hasError is set to false

[eprevot]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

When hasError="false", the step header should show a normal label even if the step is interacted and invalid

What is the current behavior?

When hasError="false", the step header shows an error state label if the step is interacted and invalid

What are the steps to reproduce?

https://stackblitz.com/edit/angular-material2-issue-gtxr8x
Go to step 2 without filling the step 1 required input : step 1 label shows error whereas it's set to hasError="false"

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material 7.1.0
Angular 7.1.1

Is there anything else we should know?

Behaviour is ok with hasError = true
If you set hasError="true" on a mat-step the step will always be styled as a step in error (even if it has not been interacted or is valid)

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