`wil::ArgvToCommandLine` does not quote empty arguments

[ai4rei]

When wil::ArgvToCommandLine is called without ArgvToCommandLineFlags::ForceQuotes, then empty arguments aren't quoted, which causes that argument to be lost in resulting command line.

For example

char const* const argv[] =
{
    "first",
    "",
    "third",
};

auto commandLine = wil::ArgvToCommandLine(_countof(argv), argv);

The expected commandLine would be "first \"\" third", but it's "first third" instead.

[dunhor]

Great find, thanks! I should have a change out shortly