grey hash boxes for all levels of abstraction

[joehart2001]

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Summary

• grey hashed out boxes for missing data
• shows all models for a test, even if the model has not been run (indicating lack of data for that test)
• if one col for a model is None, the score calculation becomes invalid and is also None

Linked issue

Resolves #253

Testing

all models and checking metrics, benchmarks and categories

[joehart2001]

I also added some edits which prevent a plot being shown for a greyed out model in some cases:

• e.g. elasticity shows one model per cell clicked, so we dont want to show the model with no data
• for tests which plot all models at once, it doenst reallty matter if we show the plot