Change Details

`getCanonicalMDString()` returns a `nullptr` for empty strings, which tripped over the `getSource()` method.

`getCanonicalMDString()` also returns a `nullptr` for empty strings, which tripped over the `getSource()` method. Solve the ambiguity of `None` versus an `Optional` containing a `nullptr` by simply storing a pointer.

`getCanonicalMDString()` also returns a `nullptr` for empty strings, which tripped over the `getSource()` method. which tripped over the `getSource()` methodSolve the ambiguity of `None` versus an `Optional` containing a `nullptr` by simply storing a pointer.