Werk #5426: df perfometer: Fixed exception when maximum value is not available

Component	User interface
Title	df perfometer: Fixed exception when maximum value is not available
Date	Oct 27, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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