Werk #4557: Stacking on metrics with empty values is now possible

Component	Metrics system
Title	Stacking on metrics with empty values is now possible
Date	Apr 11, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Pro, Checkmk Ultimate MT

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