Avoid error while killing subprocess in %%script

IPython/core/magics/script.py

@@ -208,6 +208,7 b' class ScriptMagics(Magics, Configurable):'
         try:
             out, err = p.communicate(cell)
         except KeyboardInterrupt:
+            try:
             p.send_signal(signal.SIGINT)
             time.sleep(0.1)
             if p.poll() is not None:
@@ -220,6 +221,8 b' class ScriptMagics(Magics, Configurable):'
                 return
             p.kill()
             print "Process is killed."
+            except:
+                print "Failed to kill process properly (pid={0})".format(p.pid)
             return
         out = py3compat.bytes_to_str(out)
         err = py3compat.bytes_to_str(err)