Reject empty path arguments - #771
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Path arguments become real filenames by concatenation onto "/oldroot/" or "/newroot/", so an empty path turns into the root directory. `--bind-try "" DEST` therefore gave the sandbox read/write access to the whole filesystem, and an empty destination replaced the sandbox root in the same way. The variants without `-try` failed earlier, because realpath() rejects an empty source, but the other options that take a path had no check at all. Check every path argument during option parsing, and report an empty one as a usage error.
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#715