Werk #8635: Custom graphs: When using summary operator, draw line even when some metrics have no value

Component	Metrics system
Title	Custom graphs: When using summary operator, draw line even when some metrics have no value
Date	Nov 8, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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