Werk #12194: dell_compellent_folder: Fix discovery error when data missing

Component	Checks & agents
Title	dell_compellent_folder: Fix discovery error when data missing
Date	Apr 8, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Pro, Checkmk Ultimate MT 2.0.0p2 Checkmk Pro, Checkmk Ultimate MT 1.6.0p23 Checkmk Pro, Checkmk Ultimate MT

Discovery of dell_compellent_folder failed when data was missing. Service with missing data is no longer discovered.

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