pgsql: Make the AWK default value also take effect if $AWK is an empty

Log Message:
-----------
Make the AWK default value also take effect if $AWK is an empty string.

Modified Files:
--------------
    pgsql/src/backend/utils:
        Gen_fmgrtab.sh (r1.38 -> r1.39)
       
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/Gen_fmgrtab.sh?r1=1.38&r2=1.39)

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