AgeDistribution: Poor error message for Array of Arrays

[Bridenbecker]

When the user has:

"ResultValues": [ [ 0.1, 0.2, 0.3 ] ]

They get a message like:

ERROR:  Unexpected type while parsing 'ResultValues'
in distribution 'AgeDistribution' for nodeID = 1.
Expected an array of floats but detected  an array.

It is correct, but not only if you really understand. Changing it to:

ERROR:  Unexpected type while parsing 'ResultValues'
in distribution 'AgeDistribution' for nodeID = 1.
Expected an array of floats but detected an array of arrays.

[stitova-idm]

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