Better error if correlation heatmap is created for a table that has no numeric columns #931
Description
Is your feature request related to a problem?
If Table.plot.correlationHeatmap is called on a table that has no numeric columns, only an error need at least one array to concatenate that originates from numpy is shown, which is not helpful.
Desired solution
Throw a custom error instead.
Possible alternatives (optional)
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Additional Context (optional)
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