[Plots] Fix Plots breaking on exceptionally large values

[jvigliotta]

Related: NASA-AMMOS/openmct-mcws#15

Describe your changes:

Put a check in to see if the value to be plotted can be handled by a Float32Array and if not handling as we handle other non-plottable values.

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[davetsay]

Looks good. I added one comment.

[davetsay]

great work!