Incorrect prerender-status-code on API error.

[blairlearn]

Issue description

When an API error occurs, the prerender-status-code meta tag is rendered with a value of 404. This will cause the prerender to cache the page as not existing.

ESTIMATE TBD

Steps to reproduce the issue

1. Edit your hosts file to alias clinicaltrialsapi.cancer.gov to 0.0.0.0
2. Go a valid trial details page (e.g. https://www.cancer.gov/research/participate/clinical-trials-search/v?id=NCI-2018-03695)
3. Open the browser's developer tools to the Elements/DOM view
4. Search for the meta tag with name="prerender-status-code"

What's the expected result?

• The value of the 'content' attribute is 500.
• The page body reports "An error has occurred. Please try again."

What's the actual result?

• The value of the 'content' attribute is 404.
• The page body reports "Page not found."

Additional details / screenshot

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