LokiFsStructuredAdapter responds correctly when loading file which doesn't exist
LokiFsStructuredAdapter responds correctly when loading file which doesn't exist

in autoload scenario on first run (when the file does not exist) the
adapter will callback with null instead of allowing exception to happen

ThomasConner/LokiJS,techfort/LokiJS,techfort/LokiJS,VladimirTechMan/LokiJS,VladimirTechMan/LokiJS,ThomasConner/LokiJS