(Eastern Asiatic) martial arts were generally developed as a substitute to combat with weapons where weapons were restricted. For example when some classes of the society were forbidden to own weapons (slaves, peasants) or geographical restrictions of weapons (ban of weapons in towns). This actually includes not just bare hand fighting but also substituting weapons with some other objects and tools, like farming tools (nunchagu might be the most famous example).

Therefore it's safe to say that it occurred often. But that does not mean that it was a good or proficient way of fighting. More like something out of necessity.