Allow Cherry Picking on Merged commit #2725

There is a scenario where I need to cherry pick on a merged commit.
I think it would be valid to allow a cherry pick on a merged commit, and if the cherry pick would result in no changes coming through, it can either give an error or silently continue without cherry picking.

The scenario where I require this to be allowed is in an iteration based repo, where I need to move a commit up a branch.
The current process I follow to do this is:

1. Revert the change on the lower branch.
2. Merge up to the higher branch
3. Cherry Pick the change to the higher branch

Can you let me know if this is valid, I can submit a PR tomorrow, if it is.