[zanata/zanata-platform] 6a70d8: fix: handle nullable version id list

[GitHub]

  Branch: refs/heads/ZNTA-1865-version-tm-merge
  Home:   https://github.com/zanata/zanata-platform
  Commit: 6a70d83ae75b5b24eb9453dd99c8619f04917ef3
      https://github.com/zanata/zanata-platform/commit/6a70d83ae75b5b24eb9453dd99c8619f04917ef3
  Author: Alex Eng <aeng at redhat.com>
  Date:   2017-07-04 (Tue, 04 Jul 2017)

  Changed paths:
    M server/zanata-war/src/main/java/org/zanata/service/impl/TranslationMemoryServiceImpl.java

  Log Message:
  -----------
  fix: handle nullable version id list