unicode characters in an iPython paragraph makes Spark interpreter irrsponsive

An unicode characters in an iPython paragraph makes Spark interpreter irresponsive.

To reproduce, type into a new %ipyspark code following phase (yes, it's not a valid python code but the imprtant part is that it has a long unicode dash character ):

One following unicide character makes ipythonInterpreter not responding to Cancel commands –  

 DEBUG interpreter log shows following:

DEBUG [2018-02-15 00:39:45,628] ({pool-2-thread-2} IPythonClient.java[stream_execute]:87) - stream_execute code:
One following unicide character makes ipythonInterpreter not responding to Cancel commands –
DEBUG [2018-02-15 00:39:45,632] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: ERROR:root:Exception iterating responses: 'ascii' codec can't encode character u'\u2013' in position 91: ordinal not in range(128)
DEBUG [2018-02-15 00:39:45,632] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: Traceback (most recent call last):
DEBUG [2018-02-15 00:39:45,633] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: File "/opt/cloudera/parcels/Anaconda/lib/python2.7/site-packages/grpc/_server.py", line 401, in _take_response_from_response_iterator
ERROR [2018-02-15 00:39:45,633] ({grpc-default-executor-0} IPythonClient.java[onError]:138) - Fail to call IPython grpc
io.grpc.StatusRuntimeException: UNKNOWN: Exception iterating responses: 'ascii' codec can't encode character u'\u2013' in position 91: ordinal not in range(128)
at io.grpc.Status.asRuntimeException(Status.java:543)
at io.grpc.stub.ClientCalls$StreamObserverToCallListenerAdapter.onClose(ClientCalls.java:395)
at io.grpc.internal.ClientCallImpl.closeObserver(ClientCallImpl.java:426)
at io.grpc.internal.ClientCallImpl.access$100(ClientCallImpl.java:76)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.close(ClientCallImpl.java:512)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl.access$700(ClientCallImpl.java:429)
at io.grpc.internal.ClientCallImpl$ClientStreamListenerImpl$1StreamClosed.runInContext(ClientCallImpl.java:544)
at io.grpc.internal.ContextRunnable.run(ContextRunnable.java:52)
at io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:117)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
DEBUG [2018-02-15 00:39:45,633] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: return next(response_iterator), True
DEBUG [2018-02-15 00:39:45,633] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: File "/tmp/zeppelin_ipython1942535087961089556/ipython_server.py", line 54, in execute
DEBUG [2018-02-15 00:39:45,633] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: print(request.code)
DEBUG [2018-02-15 00:39:45,634] ({Exec Stream Pumper} IPythonInterpreter.java[processLine]:388) - Process Output: UnicodeEncodeError: 'ascii' codec can't encode character u'\u2013' in position 91: ordinal not in range(128)
INFO [2018-02-15 00:39:58,894] ({dispatcher-event-loop-23} Logging.scala[logInfo]:54) - Registered executor NettyRpcEndpointRef(spark-client://Executor) (10.20.33.75:40434) with ID 2

Notice 

"Process Output: UnicodeEncodeError: 'ascii' codec can't encode character u'\u2013' in position 91: ordinal not in range(128) "

So iPython interpreter breaks on presence of any unicode data.