[BUG] legendValue panics on invalid "value types"

[npazosmendez]

This is legendValue's definition:

 legendValue(seriesList, *valueTypes)

This test for legendValue panics:

		{
			"legendValue(metric1,\"foo\")",
			map[parser.MetricRequest][]*types.MetricData{
				{"metric1", 0, 1}: {types.MakeMetricData("metric1", []float64{1, 2, 3, 4, 5}, 1, now32)},
			},
			[]*types.MetricData{types.MakeMetricData("metric1 (avg: 3)",
				[]float64{1, 2, 3, 4, 5}, 1, now32).SetNameTag("metric1")},
		},

because foo is not any of last, avg, total, min, max. It should return a nice error instead of panicking.

[npazosmendez]

@carrieedwards was this fixed? I can't find any PR that addressed this

[carrieedwards]

Ah, my apologies, I thought this was referring to a different issue that had been fixed. I'll re-open

[npazosmendez]

This was fixed here #102