Effen error if a component ancestor doesn't specify a style
Effen error if a component ancestor doesn't specify a style

If a component ancestor doesn't specify a style, quietly ignore it.

Currently the result is a little confusing:

[0330/124031:ERROR:dart_error.cc(20)] Unhandled exception:
Uncaught Error: The null object does not have a getter '_className'.

R=ojan@chromium.org

Review URL: https://codereview.chromium.org/1041863003

collinjackson/mojo,jianglu/mojo,afandria/mojo,chinmaygarde/mojo,chinmaygarde/mojo,collinjackson/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,collinjackson/mojo,collinjackson/mojo,collinjackson/mojo,collinjackson/mojo,chinmaygarde/mojo,afandria/mojo,collinjackson/mojo,chinmaygarde/mojo,afandria/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,jianglu/mojo,collinjackson/mojo,chinmaygarde/mojo,collinjackson/mojo,chinmaygarde/mojo,chinmaygarde/mojo,chinmaygarde/mojo,afandria/mojo,afandria/mojo,afandria/mojo,jianglu/mojo,jianglu/mojo,chinmaygarde/mojo