This commit introduces support for std::optional<T> in
Script::FromJSVal. When a JavaScript value is undefined or null, the
resulting optional is set to std::nullopt; otherwise, the value is
converted and wrapped.
This change allows components to cleanly handle optional script values
without needing manual null checks or exception handling in C++.
As a direct application of this feature, the Identity component now uses
std::optional<std::wstring> for the return value of GetCiv(). This
resolves a bug where formation templates (e.g., those inheriting from
template_formation.xml) do not explicitly define a civ. After commit
03f7903fec, the code assumed GetCiv() would always return a valid
string, leading to undefined behavior when it was missing.
With this update:
- GetCiv() returning undefined results in an empty optional.
- The Identity component defaults to an empty civilization string ("")
when the civ is not defined.
- This avoids crashes or actor parsing errors for civ-less templates and
improves robustness in script-C++ interaction.
Closes: #8107Fixes: #8091
5b8cb7f34b