Do all sessions/subjects have all the sequences?

[sinhaharsh]

Currently, mrQA compares each sequence from a MRI session against the reference protocol to check for non-compliant parameters. But, if a particular sequence was not acquired in a session, we don't raise any warning about it.

It is very important that any missing sequences for a particular subject in a session should be reported.

This issue makes more sense when a reference protocol is provided.
I feel this would raise much more issues, and there should be a flag to disable it in case, we know that MRI dataset we are working with ,is not research-grade.