AnimLibraries do not load animations by default.

tests/AnimDataTests.cc

@@ -21,6 +21,10 @@ TEST_CASE("Serialize AnimLibrary", "[AnimLibrary]") {
       "translation_y",
       single_bone_testdata.animation_translate_y_resource.m_filename));
 
+  // We're not actually doing anything with the animations, however loading them here ensures that
+  // when running valgrind a memory leak is detected.
+  library.LoadAnimations();
+
   // serialize
   json library_data;
   library_data = library;