Null-safety changes. Fixed bug with DataList being null during _setDataList #90
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I used the dart migrate to generate the null-safety changes and then fixed any remaining issues by hand. I was experiencing the same DataList being set to null error that others were having and I fixed that bug. Note: I had to create DataList objects and the title was required so I set the title to "--". I could have set it to "".
Thanks for your work on this widget. I'm currently using the widget in a custom Reactive Form widget.