A Canadian lawyer is a better source than me.
No pending charges and no convictions means no prohibition barring a grant of citizenship.
But sure, the interaction with law enforcement leaves a trail, and that may have been what triggered the request for fingerprints. It is IRCC's job to verify there are no charges or convictions which constitute a prohibition. Depending on what law enforcement databases show, sometimes IRCC will ask the applicant to obtain and submit official court records documenting the disposition of the case. Jump through some hoops, but otherwise not anything that will derail an application or block it.
That said, there are other reasons why IRCC requests fingerprints. So maybe it wasn't that case.