Does an academic paper need graphics?
In (sufficiently) theoretical fields, such as theoretical computer science, parts of theoretical physics, or mathematics, it is completely fine to publish a paper without graphics.
Whether in the case of your specific paper, topic, or field graphics would have helped is a different question, and essentially impossible to answer here with the information given. On the other hand, if it is a field where papers with no graphics are reasonably common, there should be not a big issue in convincing the editor that graphics are unnecessary.
Note that similar arguments could be applied to other things, like examples, applications, etc.: Nice to have, they likely don't hurt, but not needed in sufficiently abstract fields of research.