Issue 116 initialize with empty array

[dsenalik]

PHP8 related issue #116
Change all field initializations to use an empty array instead of NULL.
For consistency, one field that used an empty string is also changed to an empty array.

[dsenalik]

Under PHP8, all of the non-functional widgets with the call to parent::form prevent saving on a page where the field is present. I am going to remove them all until the widgets can be made functional.