message: Fix install_empty_argument by passing an empty arg
diff: @@ -1241,7 +1241,7 @@ dependencies = [
  fn install_empty_argument() {
  // Bug 5229
  assert_that(
  - cargo_process("install "),
  + cargo_process("install").arg(""),
  execs().with_status(1).with_stderr_contains(
  "[ERROR] The argument '<crate>...' requires a value but none was supplied",
  ),
  