Werk #15149: agent_azure: Fix crash if the metric isn't found

Component	Agent bakery
Title	agent_azure: Fix crash if the metric isn't found
Date	Feb 27, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p23 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The Azure agent would crash if the metric wasn't available for a resource. Now, the agent doesn't crash and retries to fetch available metrics.

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