Jan Edmund Lazo 0d0eeff8a3 eval: add v:_null_string ...

Replacement for Vim's test_null_string().
Vim uses it to verify that its codebase handles null strings.
Preparation for the Test_null_list() in patch v8.2.1822.

Use v:_null_string, not non-existent env var, for null string tests.

Mention v:_null_string in id() because id(v:_null_string) returns (nil).

2021-04-08 22:36:20 -04:00

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