Assert that resources is map like before treating as a map

[Garbett1]

Description:

Link to tracking Issue:

Testing:

Documentation:

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[RoryCrispin]

it would be interesting to share where you hit a bug here

[Garbett1]

Hit a panic when trying to extract a resource from a log record that didn't have it. Decided to cover more scenarios by checking existence + that it is actually a map.