Replace occurrence of EmptyCString with 0-length _ns literal
This is just to follow mozilla with https://bugzilla.mozilla.org/show_bug.cgi?id=1650145. The only occurrence I could find in our patches is in xpcom/io/TorFileUtils.cpp.
This is just to follow mozilla with https://bugzilla.mozilla.org/show_bug.cgi?id=1650145. The only occurrence I could find in our patches is in xpcom/io/TorFileUtils.cpp.