Merge /AWAY '' fix from Adeodato.

diff --combined NEWS
index 3c998707ccec7fe070d8967eea429a1614383ec3,277b26a0a14c59a824cc219cd0cae463fc9fbd41..04eb8f79e61e63090819e3065a10a803949bdee4
--- 1/NEWS
--- 2/NEWS
+++ b/NEWS
@@@ -24,8 -24,6 +24,10 @@@ Ctrlproxy 3.0.4 UNRELEASE
  
        * Start checking plugin versions.
  
 +      * Open log file if stdout goes away.
 +
++      * Make /AWAY with empty argument mark as unaway. (Adeodato Simó)
++
    INTERNALS
  
      * Moved some common logging code to the core.