bug: Writing multiple errors after bad request

[lukewhrit]

Describe the bug

Currently, creating a bad document will cause two errors to be reported in an invalid JSON format.

{"error":"Content: the length must be between 2 and 400000.","payload":{}}
{"error":"sql: no rows in result set","payload":{}}

To Reproduce

Steps to reproduce the behavior (What were you doing at the time?):

1. Go to a https://spaceb.in
2. Create a document with only one character to trigger an error
3. Done

Expected behavior

We should only include the first error and end the response before the second one is written.