QTY-7536: Safely access methods from response body

[tylerCaineRhodes]

Here is the link for the bug in Jira.

This is happening when we try to access properties on a non-existent key in the response body. Our guard clause is ultimately what is throwing this exception:

submission.submitted_at = turnitin_client.uploaded_at if turnitin_client.uploaded_at

Here uploaded_at is throwing the issue with the following code because meta is not present in this case:

response.body['meta']['date_uploaded']

I have created a method to always return nil in these cases in order for these methods to behave as expected.

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