YAML syntax error checking

[EdAtkin]

Describe the bug

Error in YAML syntax is not necessarily flagged in KinematicCuts in Systmatics Yaml

To Reproduce

Steps to reproduce the behaviour:

1. Go to your Systematics.yaml
2. Look at KinematicCuts
3. Put bad syntax under KinmaticCuts e.g.

KinamaticCuts:
 -TrueNeutrinoEnergy: [0.5, 1.0]`

where it should be :

KinamaticCuts:
 - TrueNeutrinoEnergy: [0.5, 1.0]

5. TrueNeutrinoEnergy will not be properly picked up.

Additional context

There may be some other checks that are supported by yaml-cpp inherently.