James McCoy 3ff92ba1ee eval: save_tv_as_string: Correctly handle an empty string ...

When tv_get_string_chk returns a non-NULL value, we have a valid string.
Propagating an error state (*len = -1, NULL return) for an empty string
is invalid.

Closes #6554

2018-01-23 17:56:50 -05:00

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