Werk #7303: smart: Handle snmp data without normalized values correctly

Component Checks & agents
Title smart: Handle snmp data without normalized values correctly
Date May 10, 2019
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 1.6.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

SNMP data may contain strings "---" for the OIDs which represent the normalized value and threshold. For the "Reallocated Event Count" missing valid data resulted in a crash of the check function. This werk fixes this by adding proper handling of this edge case.

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