If a style doesn't specify text style (normal/bold/italic/bold-italic)
then default to normal instead of throwing an error.
Bug: http://b.android.com/61358
Change-Id: I0138c73807a5ff6e4d938a99ece3044333110aa1
(cherry-picked from c63e87d53d)
Layoutlib is a custom version of the android View framework designed to run inside Eclipse. The goal of the library is to provide layout rendering in Eclipse that are very very close to their rendering on devices. None of the com.android.* or android.* classes in layoutlib run on devices.