jilles 1af5c5cc5f sh: Don't lose $? when backquoted command ends with semicolon or newline.
An empty simple command was added and overwrote the exit status with 0.

This affects `...` but not $(...).

Example:
  v=`false;`; echo $?
2013-01-13 19:19:40 +00:00
..
2011-11-28 23:10:53 +00:00