title: java.lang.IllegalArgumentException: This component requires that you specify a valid android:textAppearance attribute
body: <p>I have a com.google.android.material.button.MaterialButton component in one of my layout file and I get this error when I am using the latest version of the Material Components library (com.google.android.material:material:1.0.0-alpha3):</p>
  
  <p><strong>java.lang.IllegalArgumentException: This component requires that you specify a valid android:textAppearance attribute.</strong></p>
  
  <p>It wasn't present in 1.0.0-alpha1. Is this a bug in the library or should I just specify a textAppearance attribute from now?</p>