BUG #13843: Problem with output of an index definition by "pg_restore"

The following bug has been logged on the website:

Bug reference:      13843
Logged by:          Naoki Takami
Email address:      takami@orega.co.jp
PostgreSQL version: 9.4.5
Operating system:   Windows7
Description:

I define the following index.
CREATE INDEX TEST_IDX ... WITH
(tokenizer='TokenBigramSplitSymbolAlphaDigit', normalizer='')
When it was input by "pg_restore" after outputting this by "pg_dump", the
following error occurred.

could not execute query: ERROR:  syntax error at or near ")"
line 1: ...H (tokenizer=TokenBigramSplitSymbolAlphaDigit, normalizer=);