CoRIM Extensions: Incorrect Assumptions on Measurement Values Map validity

[yogeshbdeshpande]

The current code Valid method of MVal struct (measurement.go) assumes that Extensions can only be on top of at least one base type (defined in standards) to be present! Hence it returns with an Error if ONLY Extensions are present with no base types defined.

However, there can be cases (like Intel Profile) where ONLY extensions are present with not even a single base type (from MVal struct) present