Werk #5091: Perfometer: Allow zero as maximal value; Fixed unsupported operand type for /: 'float' and 'NoneType'

Component	Checks & agents
Title	Perfometer: Allow zero as maximal value; Fixed unsupported operand type for /: 'float' and 'NoneType'
Date	Aug 9, 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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