Make exception handling consistent in project

[ogeagla]

This one is an outlier: https://github.com/ogeagla/clj-hypercomplex/blob/master/src/hypercomplex/cayley_dickson_construction.clj#L106

The rest use style like: https://github.com/ogeagla/clj-hypercomplex/blob/master/src/hypercomplex/core.clj#L229

Prefer second style.