DefaultFileSystemReader: if directory does not exist, return empty list of file names. This fixes a cryptic TinyIoC exception that is thrown if the root path provider points to a path, or calculates a path that does not exist.
DefaultFileSystemReader: if directory does not exist, return empty list of file names. This fixes a cryptic TinyIoC exception that is thrown if the root path provider points to a path, or calculates a path that does not exist.

jeff-pang/Nancy,JoeStead/Nancy,davidallyoung/Nancy,davidallyoung/Nancy,davidallyoung/Nancy,blairconrad/Nancy,xt0rted/Nancy,sadiqhirani/Nancy,NancyFx/Nancy,khellang/Nancy,jeff-pang/Nancy,davidallyoung/Nancy,khellang/Nancy,JoeStead/Nancy,xt0rted/Nancy,NancyFx/Nancy,damianh/Nancy,xt0rted/Nancy,khellang/Nancy,danbarua/Nancy,damianh/Nancy,davidallyoung/Nancy,danbarua/Nancy,blairconrad/Nancy,xt0rted/Nancy,blairconrad/Nancy,NancyFx/Nancy,jeff-pang/Nancy,danbarua/Nancy,sadiqhirani/Nancy,NancyFx/Nancy,sadiqhirani/Nancy,khellang/Nancy,sadiqhirani/Nancy,jeff-pang/Nancy,danbarua/Nancy,damianh/Nancy,JoeStead/Nancy,blairconrad/Nancy,JoeStead/Nancy