dev: usage option type for Value::list_from with example value

[sshaplygin]

Impact Assessment

How would this change affect:

• [ ] Performance
• [ ] Maintainability
• [ ] Backward compatibility
• [x] User experience

Area of Improvement

I need example how to use option type for Value::list_from with example value. The examples have case how to use list value, but haven't use option values

Current Situation

Suggested Improvement

Add new example case with optional usege

[sshaplygin]

I patched sdk at the local version and used next row:

Value::optional_from(Value::Text("".to_string()), Some(Value::Text("test".to_string()))).unwrap(),

is it common way?