rdebug: history is not saved if exception occurs

[ashumkin]

If rdebug runs (local) script which finishes normally it saves its history (with readline).
But if script ends with an exception, history is not saved. That's annoying.

[cldwalker]

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[cldwalker]

Agreed that's annoying. Enhancements welcome. Note that debugger is only for 1.9.x