Update to return null if XR isn't initialized

Author: keveleigh

Assets/MRTK/Providers/XRSDK/LoaderHelpers.cs

@@ -13,27 +13,40 @@ public static class LoaderHelpers
         /// Checks if the active loader has a specific name. Used in cases where the loader class is internal, like WindowsMRLoader.
         /// </summary>
         /// <param name="loaderName">The string name to compare against the active loader.</param>
-        /// <returns>True if the active loader has the same name as the parameter.</returns>
-        public static bool IsLoaderActive(string loaderName) =>
+        /// <returns>True if the active loader has the same name as the parameter. Null if there isn't an active loader.</returns>
+        public static bool? IsLoaderActive(string loaderName)
+        {
 #if XR_MANAGEMENT_ENABLED
-            XRGeneralSettings.Instance != null
-            && XRGeneralSettings.Instance.Manager != null
-            && XRGeneralSettings.Instance.Manager.activeLoader != null
-            && XRGeneralSettings.Instance.Manager.activeLoader.name == loaderName;
+            if (XRGeneralSettings.Instance != null
+                && XRGeneralSettings.Instance.Manager != null
+                && XRGeneralSettings.Instance.Manager.activeLoader != null)
+            {
+                return XRGeneralSettings.Instance.Manager.activeLoader.name == loaderName;
+            }
+
+            return null;
 #else
-            false;
+            return false;
 #endif
+        }
 
 #if XR_MANAGEMENT_ENABLED
         /// <summary>
         /// Checks if the active loader is of a specific type. Used in cases where the loader class is accessible, like OculusLoader.
         /// </summary>
         /// <typeparam name="T">The loader class type to check against the active loader.</typeparam>
-        /// <returns>True if the active loader is of the specified type.</returns>
-        public static bool IsLoaderActive<T>() where T : XRLoader =>
-            XRGeneralSettings.Instance != null
-            && XRGeneralSettings.Instance.Manager != null
-            && XRGeneralSettings.Instance.Manager.activeLoader is T;
+        /// <returns>True if the active loader is of the specified type. Null if there isn't an active loader.</returns>
+        public static bool? IsLoaderActive<T>() where T : XRLoader
+        {
+            if (XRGeneralSettings.Instance != null
+                && XRGeneralSettings.Instance.Manager != null
+                && XRGeneralSettings.Instance.Manager.activeLoader != null)
+            {
+                return XRGeneralSettings.Instance.Manager.activeLoader is T;
+            }
+
+            return null;
+        }
 #endif
     }
 }