babel-plugin-transform-decorators: Property is readonly if no value set

[SPAHI4]

Original issue here loganfsmyth/babel-plugin-transform-decorators-legacy#57

It's still not solved on 7.0.0-alpha.1

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[hzoo]

We haven't announced Babel 7, it's still alpha, and the pr to move legacy into transform-decorators was simply porting the code over so no work has been done. So I didn't expect it to have solved any of the issues from the repo. I would just follow the issues there until we do a release and we can port that stuff over.