test whether a variable exists

When Who What
2020-04-13 08:01:07 Fabien Coelho (calvin) Added annotation "Initial CF entry: https://commitfest.postgresql.org/19/1528/" to alpine.DEB.2.20.1802191909500.21372@lancre
2018-10-01 02:34:08 Michael Paquier (michael-kun) Closed in commitfest 2018-09 with status: Returned with feedback
2018-08-10 22:12:48 Andrew Dunstan (adunstan) Closed in commitfest 2018-07 with status: Moved to next CF
2018-04-10 12:36:16 David Steele (dsteele) Closed in commitfest 2018-03 with status: Moved to next CF
2018-02-19 18:23:57 Fabien Coelho (calvin) Changed authors to Fabien Coelho (calvin)
2018-02-19 18:23:46 Fabien Coelho (calvin) Attached mail thread alpine.DEB.2.20.1802191909500.21372@lancre
2018-02-19 18:23:45 Fabien Coelho (calvin) Created patch record