[zanata/zanata-server] ca2296: Hide last modified by if no data

[GitHub]

  Branch: refs/heads/rhbz1243672-source-refs
  Home:   https://github.com/zanata/zanata-server
  Commit: ca229612b847f97bebb555ab702ccce2caade59d
      https://github.com/zanata/zanata-server/commit/ca229612b847f97bebb555ab702ccce2caade59d
  Author: Alex Eng <aeng at redhat.com>
  Date:   2015-07-20 (Mon, 20 Jul 2015)

  Changed paths:
    M zanata-war/src/main/java/org/zanata/webtrans/client/ui/TransUnitDetailsPanel.java
    M zanata-war/src/main/java/org/zanata/webtrans/client/ui/TransUnitDetailsPanel.ui.xml

  Log Message:
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