* Fix bug in ETFConstituentUniverseSelectionModel()
The bug was raised after calling an overload constructor using just the
ticker as parameter. Since the universeFilterFunc was null, the method
Extensions.TryConvertToDelegate<T> returned true and thus, the filter
func assigned was the one returned by the method
`ConvertToUniverseSelectionSymbolDelegate()` which used the null
filterfunc.
* Handle potential future bugs
Ricardo Andrés Marino Rojas
0cd979f3bd