Revert "Fix #14101: $().data() should be undefined, not null"

This reverts commit 30eee925dbc9f8d465ccf064f48c24061ffdc378.
Revert "Revert "Fix #14101: $().data() should be undefined, not null""

This reverts commit dc73d1aa3968aefba0897fdb8ad4d7a837eae81b.
Revert "Revert "Revert "Fix #14101: $().data() should be undefined, not null"""

This reverts commit 7091df51349348e133d2977eefb7a983b4974c99.