The main reason for not topping a plant during flowering is because it causes the branches under it to compete to be the main branch, taking away from the flowering. In other words the lateral branches are competing for apical dominance.
If the branch end is truly broken removing that part of the cola will cause no harm. If it's not broken but just bent, you can either leave it, prop it up, or remove it. If you are far enough into the flowering stage where you have colas then snipping it should not cause a problem.