fn present(value: Option<&str>) -> Option<&str>Expand description
Treats an empty identity field the same as a missing one.
The webapp builds the same subjects with JavaScript || fallbacks, where an empty
string counts as missing. Doing the same here keeps both sides on one subject when
a config has "" in an identity field.
§Arguments
value- Identity field from the config or environment.
§Returns
None if value is None or an empty string, otherwise value.