Avoid exception when parsing arrays in raw data

[jwalgran]

Overview

When submitting a facility via the API the raw data for fields like product_type can contain an array value. Attempting to call fload() on a list was raiding a TypeError rather than a ValueError, resulting in an unhandled exception in the try_parse_int_from_float helper.

Connects #1903

Testing Instructions

This assumes you have run ./scripts/resetdb

• Check out develop
• Log in as c2@example.com
• Browse http://localhost:8081/api/docs/#!/facilities/facilities_create and authenticate with token 1d18b962d6f976b0b7e8fcf9fcc39b56cf278051
• POST this facility detail that matches a dev data facility

{
"name":"1v1 Fight Gear",
"address": "5320 Tower Way, Sanford, 32773, Florida ",
"country":"us",
"product_type": ["api a", "api b"]
}

• Browse http://localhost:6543/settings, selected the embed tab, and check the "100%" box to get the preview to display
• In the embed iframe, view the details of the "1v1 Fight Gear" facility
• Verify that an exception is raised
• Checkout this branch
• Refresh them embed and verify that the exception is resolved

Checklist

• fixup! commits have been squashed
• CI passes after rebase
• CHANGELOG.md updated with summary of features or fixes, following Keep a Changelog guidelines
• This PR is targeted at the correct branch (develop vs. ogr/develop)
• If this PR applies to both OAR and OGR a companion PR has been created

[TaiWilkin]

This is working well. Good to go.

[jwalgran]

Thanks for the review.