#84 Fix issue with checking ecs exec when aws guardduty is enabled, when it is enabled by default there is no managedAgents key, so array is null, and it results in jq: error (at <stdin>:175): Cannot iterate over null (null)

[tskorupka]

Issue #84, if available:

Description of changes: Added default empty array return for managedAgents when checking for agensStatus array, since error occurs when you have enabled AWS Guard Duty agent being attached to ECS.

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