SELECT clause without parameters

I would like to ask what's the reason of change SELECT behaviour.
In distributions below 9.4 SELECT without any parameters caused a syntax
error and now gives empty set. Was it made for some bigger aim ? :)

for instance 8.4:
postgres=# select version();
version
-----------------------------------------------------------------------------------------------------
PostgreSQL 8.4.17 on i486-pc-linux-gnu, compiled by GCC gcc-4.4.real
(Debian 4.4.5-8) 4.4.5, 32-bit
(1 wiersz)

postgres=# select
postgres-# ;
ERROR: syntax error at or near ";"
LINIA 2: ;

and 9.4:
psql (9.4.4)
Type "help" for help.

postgres=# select
postgres-# ;
--
(1 row)

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