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The original coding in ri_triggers.c had partial support for the concept of zero-column foreign key constraints. But this is not defined in the SQL standard, nor was it ever allowed by any other part of Postgres, nor was it very fully implemented even here (eg there was no support for preventing PK-table deletions that would violate the constraint). Doesn't seem very useful to carry 100-plus lines of code for a corner case that no one is interested in making work. Instead, just add a check that the column list read from pg_constraint is non-empty.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.