[AutoML] Fix for Exception thrown in cross val when one of the score equals infinity. (dotnet#4073)

* bumped version

* change versions in nupkg

* revert version bump in branch props

* added infinity fix

Author: srsaggam

src/Microsoft.ML.AutoML/Experiment/Runners/CrossValSummaryRunner.cs

@@ -90,7 +90,7 @@ private static int GetIndexClosestToAverage(IEnumerable<double> values, double a
             for (var i = 0; i < values.Count(); i++)
             {
                 var distFromAvg = Math.Abs(values.ElementAt(i) - average);
-                if (distFromAvg < smallestDistFromAvg)
+                if (distFromAvg < smallestDistFromAvg || smallestDistFromAvg == double.PositiveInfinity)
                 {
                     smallestDistFromAvg = distFromAvg;
                     avgFoldIndex = i;