pgsql: pgindent: improve error messages

pgindent: improve error messages

per suggestion from Gurjeet Singh

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/5003f94f661d3eff0c44774576fe2f1ae202da86

Modified Files
--------------
src/tools/pgindent/pgindent | 33 +++++++++++++++++----------------
1 files changed, 17 insertions(+), 16 deletions(-)

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