Merge fix for treatment of empty chunks in unified diff writer. Fixes #543

diff --cc AUTHORS
index 252f8048bad8d1dd0318ff9c27edeedfb43de47c,252f8048bad8d1dd0318ff9c27edeedfb43de47c..fa300d7537d58037200ad203be2fd345d3ef0536
--- 1/AUTHORS
--- 2/AUTHORS
+++ b/AUTHORS
@@@ -128,5 -128,5 +128,6 @@@ Segev Finer <segev208@gmail.com
  fviolette <fviolette@talend.com>
  dzhuang <dzhuang.scut@gmail.com>
  Antoine Pietri <antoine.pietri1@gmail.com>
++Taras Postument <trane9991@gmail.com>
  
  If you contributed but are missing from this list, please send me an e-mail.

diff --cc NEWS
index 2e623e8b9c48ca2461b9791a90a649fb25a6aa82,2e623e8b9c48ca2461b9791a90a649fb25a6aa82..7187610bec6efd7badf2aaec277dd3221abccbe7
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -5,6 -5,6 +5,8 @@@
    * Read config during porcelain operations that involve remotes.
      (Jelmer Vernooij, #545)
  
++  * Fix headers of empty chunks in unified diffs. (Taras Postument, #543)
++
  0.18.2        2017-08-01
  
   TEST FIXES