Issue #9871: Prevent IDLE 3 crash when given byte stings

with invalid hex escape sequences, like b'\x0'.
(Original patch by Claudiu Popa.)

diff --cc Misc/ACKS
Simple merge

diff --cc Misc/NEWS
index e3203d3efdcca17f25b69e9c70a6dbcd74d00a75,5289c3799dd24a30e643c11169f57ea3cfe575b0..6df52156636d4f3f3af470b05738a0ca2394ed05
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -274,21 -92,6 +274,25 @@@ Core and Builtin
  Library
  -------
  
++- Issue #9871: Prevent IDLE 3 crash when given byte stings
++  with invalid hex escape sequences, like b'\x0'.
++  (Original patch by Claudiu Popa.)
++
 +- Issue #12306: Expose the runtime version of the zlib C library as a constant,
 +  ZLIB_RUNTIME_VERSION, in the zlib module. Patch by Torsten Landschoff.
 +
 +- Issue #12959: Add collections.ChainMap to collections.__all__.
 + 
 +- Issue #8933: distutils' PKG-INFO files and packaging's METADATA files will
 +  now correctly report Metadata-Version: 1.1 instead of 1.0 if a Classifier or
 +  Download-URL field is present.
 +
 +- Issue #12567: Add curses.unget_wch() function. Push a character so the next
 +  get_wch() will return it.
 +
 +- Issue #9561: distutils and packaging now writes egg-info files using UTF-8,
 +  instead of the locale encoding.
 +
  - Issue #8286: The distutils command sdist will print a warning message instead
    of crashing when an invalid path is given in the manifest template.