Better error message when there are fewer nodes than the number of dimensions in pmds layout

[johandahlberg]

Description

Check up-front that the number of nodes is greater than the number of dimensions being requested in the pmds layout - if not give a clearer error message.

Fixes: exe-2061

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Unit test added and some manual testing.

PR checklist:

• This comment contains a description of changes (with reason).
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• If a new tool or package is included, I have updated poetry.lock, and cited it properly
• I have checked my code and documentation and corrected any misspellings
• I have documented any significant changes to the code in CHANGELOG.md

[ludvigla]

Looks perfect. Great work!