SortBy function panics if invalid consolidation function passed in

[carrieedwards]

The sortBy() function takes a consolidation function as a parameter (with a default value of 'average'). If an invalid consolidation function name is passed in, the sortBy() function still attempts to do the sort, calling consolidations.SummarizeValue(). A panic can occur when the 'default' case in the SummarizeValues switch statement is hit.

An example query to replicate this issue:

sortBy(groupByNode(testMetric*, 5, 'max'), 'true', true)

The resulting error that occurs is:

recovered from panic: "runtime error: index out of range [1] with length 1"