Werk #8483: Fix exception about dist_function missing when zooming out over 10 or more years

Component	Metrics system
Title	Fix exception about dist_function missing when zooming out over 10 or more years
Date	Mar 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Enterprise (CEE), Checkmk MSP (CME)

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