Always dynamically allocate PropertyTable

- `Texture::~Texture` expects `props` to be dynamically allocated.

- `GetPropertyTable` returned a pointer to an existing `PropertyTable`
  but is expected to return a newly, dynamically allocated one.

- `PropertyTable::PropertyTable()` suggests that an empty `element`
  property is valid.

fix #46876
fix #45573

(cherry picked from commit 09bda3f140)

modules/fbx/fbx_parser/FBXProperties.cpp

@@ -150,6 +150,11 @@ PropertyTable::PropertyTable() :
 		templateProps(), element() {
 }
 
+// ------------------------------------------------------------------------------------------------
+PropertyTable::PropertyTable(const PropertyTable *templateProps) :
+		templateProps(templateProps), element() {
+}
+
 // ------------------------------------------------------------------------------------------------
 PropertyTable::PropertyTable(const ElementPtr element, const PropertyTable *templateProps) :
 		templateProps(templateProps), element(element) {