Obli-negated

Obli-negated
When you are released from a task or obligation, one which you volunteered happily to do because the other person needed you, but by circumstance and powers not in your control you do not have to do it, but still get credit for being ready, willing and able.

My plans got obli-negated when I promised my neighbor I would walk her dog while she was away. Her trip got cancelled so I didn’t have to do it, but now she thinks I’m a good person.