[BUGS] BUG #14459: Error from query with too many binds has no message

The following bug has been logged on the website:

Bug reference:      14459
Logged by:          Sean Griffin
Email address:      sean@seantheprogrammer.com
PostgreSQL version: 9.6.1
Operating system:   macOS
Description:

If a query is performed with more than 34464 bind parameters, the query will
fail. This is fine, but attempting to get the error message with
`PQresultErrorField` and `PG_DIAG_MESSAGE_PRIMARY` will return `NULL`. The
documentation states that the `PG_DIAG_MESSAGE_PRIMARY` field is always
present.


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