[issue27613] Empty iterator is rendered as a single bracket ] when using json's iterencode

[Grigory Statsenko]

Grigory Statsenko added the comment:

With streaming you never know the real length before you're done iterating.

Anyway, the fix really shouldn't be that complicated:
In _iterencode_list just yield  the '[' instead of saving it to buf

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27613>
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