No worries man, same kinda thing happened on my first grow. I was experimenting with low stress training and accidentally tied a piece of thread to tightly around the stem and when I woke up the top 3 nodes of the plant had been cut off.

If anything I'd say it helped my grow. The 4 remaining biggest branches all turned into stems themselves and it grew into a giant bush, and was almost double the size of the other plant I had by the end of the grow.

Its a minor set back, nothing more. imp: