[dovecot/core] 437ef4: auth: db-lua - Remove unnecessary pushnil usage

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/dovecot/core
  Commit: 437ef43c4fb02befa450811976772825958a4528
      https://github.com/dovecot/core/commit/437ef43c4fb02befa450811976772825958a4528
  Author: Aki Tuomi <aki.tuomi at dovecot.fi>
  Date:   2018-05-22 (Tue, 22 May 2018)

  Changed paths:
    M src/auth/db-lua.c

  Log Message:
  -----------
  auth: db-lua - Remove unnecessary pushnil usage

lua_pushstring is NULL-safe



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