interpreter: validate argument to string.split() for empty string

The underlying Python implementation throws in this case, and I'm not
sure what the correct result here would be if we allowed it. Convert to
None and don't split? Split every character?

I've gone with throwing InvalidArguments, which maintains the current
behavior of "doesn't work" but with a nicer output. Any other change
would require a FeatureNew anyway, and can wait till 1.11.

Fixes: #15335

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