Werk #6563: Fixed displaying of joined perf-o-meter columns

Component	Reporting & availability
Title	Fixed displaying of joined perf-o-meter columns
Date	Sep 13, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Pro, Checkmk Ultimate MT 1.5.0p5 Checkmk Pro, Checkmk Ultimate MT 1.4.0p36 Checkmk Pro, Checkmk Ultimate MT

When adding views containing Perf-O-Meter painters of joined services the Perf-o-meters were not displayed. Instead an empty cell was rendered.

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