[iOS] Use JavaScript in Message Center RichPage

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Hello, 

I want to implement a basic/default MessageCenter from Airship. I'm doing it in below way: 

UAMessageCenter.shared().display()

Every seems works in this way but I have a problem with JavaScript scripts inside the HTML body.

It seems that neither function is invoked even those from this https://docs.airship.com/guides/data/custom-events/#javascript-for-rich-pages example.

Maybe I'm doing something wrong with message configuration. 

What should I try to solve this problem?