[jenkinsci/zubhium-plugin] a1007f: Fix NPE after updating

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/jenkinsci/zubhium-plugin
  Commit: a1007f34110b039e81e09538f12ac0c2942c10bf
      
https://github.com/jenkinsci/zubhium-plugin/commit/a1007f34110b039e81e09538f12ac0c2942c10bf
  Author: Andreas Katzig <git...@photono.de>
  Date:   2012-08-14 (Tue, 14 Aug 2012)

  Changed paths:
    M src/main/java/zubhium/ZubhiumUploader.java

  Log Message:
  -----------
  Fix NPE after updating

New replace flag is null if you've updated your existing plugin version.
Integrated null check.