[C++] Update to new Mediacreation view usage

New Mediacreation uses optional for its property access.

Signed-off-by: Elliot Morris <[email protected]>

src/resolver.cpp

@@ -128,16 +128,19 @@ std::string resolveToPath(const openassetio::hostApi::ManagerPtr &manager,
   static constexpr std::string_view kFileURLScheme{"file://"};
   static constexpr std::size_t kProtocolSize = kFileURLScheme.size();
 
-  openassetio::Str url = LocatableContentTrait(traitsData).getLocation();
-  if (url.rfind(kFileURLScheme, 0) == openassetio::Str::npos) {
-    std::string msg = "Only file URLs are supported: ";
-    msg += url;
-    throw std::runtime_error(msg);
+  if (auto url = LocatableContentTrait(traitsData).getLocation(){
+    if (url.rfind(kFileURLScheme, 0) == openassetio::Str::npos) {
+      std::string msg = "Only file URLs are supported: ";
+      msg += url;
+      throw std::runtime_error(msg);
+    }
+
+    // TODO(tc): Decode % escape sequences properly
+    replaceAllInString(url, "%20", " ");
+    return url.substr(kProtocolSize);
   }
 
-  // TODO(tc): Decode % escape sequences properly
-  replaceAllInString(url, "%20", " ");
-  return url.substr(kProtocolSize);
+  return "";
 }
 
 /**