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 Pro, Checkmk Ultimate MT 2.0.0p3 Checkmk Pro, Checkmk Ultimate MT

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

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