REPL wrap Issue when a response ends in a continuation

[Kotarski]

https://github.com/Calysto/metakernel/blob/2de5d373c41d7b4af3879c2764fdbe904cc12378/metakernel/replwrap.py#L243

I've been using this to wrap a python interpreter and have come across the issue that the run_command code doesn't distinguish between a hard continuation where a statement is missing a body e.g.

if true:

and a soft continuation where a statement could contain more in its body:

if true:
    print("hi")

This results in the value error being raised each time a nested statement is used.

To solve the issue in Python the code can be modified to:

        if self._expect_prompt(timeout=timeout) == 1:
            # Try and resolve the continuation
            self.sendline("")
            if self._expect_prompt(timeout=timeout) == 1:
                # We got the continuation prompt - command was incomplete
                self.interrupt(continuation=True)
                raise ValueError("Continuation prompt found - input was incomplete:\n" + command)

Perhaps this could be added as an option on the class?