Can we make user mapping optional e.g. for SQLite?

[mlt]

Context

One usually connects to SQLite without any authentication. However odbc_fdw expects for user mapping to exist.

Steps to Reproduce

1. Have SQLite data source
2. CREATE SERVER odbc_sqlite FOREIGN DATA WRAPPER odbc_fdw OPTIONS (driver 'SQLite3 ODBC Driver', odbc_database 'C:\path\to\sqlite3.db', odbc_bigint 'true' ); (I am on Windows)
3. Forget to include CREATE USER MAPPING FOR current_user SERVER odbc_sqlite;
4. Try to import tables IMPORT FOREIGN SCHEMA main FROM SERVER odbc_sqlite INTO public;

Current Result

Get user mapping not found for "myuser"

Expected result

Have table in public schema.

System trying to connect to and version

Tried with PostgreSQL 11 on MS Windows 64 bit with SQLite ODBC driver from http://www.ch-werner.de/sqliteodbc/ .