Werk #10212: aws_limits: Fixed parsing old agent data which does not contain information about region

Component	Checks & agents
Title	aws_limits: Fixed parsing old agent data which does not contain information about region
Date	Oct 8, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.0.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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