Nothing you can do or needs to be done............plant will be just fine.
Throw that small piece away, it won't do anything.
Reduce your feeds too, plants look super dark green.............not ideal during flowering..............too much fertilizer will cause leafy growth at the expense of flower size.
shit happens. Sometimes you snap a branch while training, too. If too severe you throw it out, chastize yourself a bit to be more careful, and move on.
such a tiny loss in this instance, so it shouldn't bother you too much.