Werk #5420: diskspace cleanup: Fixed exception when "Delete additional files when disk space is below" is enabled

Component	Site management
Title	diskspace cleanup: Fixed exception when "Delete additional files when disk space is below" is enabled
Date	Oct 26, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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