Eliminate warning message on `local_path()` call

[lawinslow]

Whenever I call this, I get this warning message

> local_path()
[1] "b:/big_data/hydrolinks/"
Warning message:
In dir.create(path, recursive = TRUE) :
  'b:\big_data\hydrolinks' already exists

@rainshapes Could we eliminate that?

[lawinslow]

Fixed.