Werk #12313: checks: diskstat: Fix predictive values

Component	Checks & agents
Title	checks: diskstat: Fix predictive values
Date	Apr 7, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p3 Checkmk Enterprise (CEE), Checkmk MSP (CME)

Disk IO should now be able to display predictive values. Before this fix checkmk crashed with a KeyError.

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