I think music isn't pointless without emotion, but it isn't necessarily what produces the best music. For example, 60's atonal compositions, while fascinating to analyze, sound god-awful. Not to suggest that the composers of atonal music do not put emotion into their pieces.
Another thought, what if instead of conveying or including emotions in a composition, you simply included yourself? In zen buddhism there is a concept called kokoro ire, literally the inclusion of one's own spirit. If you were to make your composition an extension of yourself, the piece would become a living, breathing thing, because you are a living, breathing thing. It's similar to including emotion, but instead of the piece saying, "This is what meloncholy sounds like," it would be "This is me when I am sad."