Edge case for global_bin_DSC

[JosefBuchner]

Setting edge cases for DSC does not seem to affect the global_bin_DSC, possibly due to separate calculation.

!Metric DSC: !MetricZeroTPEdgeCaseHandling {empty_prediction_result: !EdgeCaseResult ZERO, empty_reference_result: !EdgeCaseResult ZERO, no_instances_result: !EdgeCaseResult NAN, normal: !EdgeCaseResult ZERO}

Therefore, with no instances at all, the global_bin_DSC is always 0 and can not be adjusted with this configuration.
I would recommend using the DSC edge cases also for the global_bin_DSC.