Fix display of errors in compiled code on Python 3.

Closes gh-1100

IPython/core/ultratb.py

@@ -879,7 +879,7 @@ def linereader(file=file, lnum=[lnum], getline=linecache.getline):
                 # enclosing scope.
                 for token in generate_tokens(linereader):
                     tokeneater(*token)
-            except IndexError:
+            except (IndexError, UnicodeDecodeError):
                 # signals exit of tokenizer
                 pass
             except tokenize.TokenError,msg: