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#410 — 10.2.1.*.6: return the result of CreateMutableBinding

In "CreateVarBinding (N, D)"
and "CreateVarBinding (N, D)",
the algorithm says:
"Return the result of calling envRec's CreateMutableBinding concrete method"

But CreateMutableBinding doesn't return a value.

Change "Return the result of calling" to just "Call".

actually, an abnormal completion can occur in some situations. Fixed CreateMutableBinding to always return something and all calls to check for abnormal completion.

fixed in editor's draft