Add test: We shouldn't error when main remote options are unset

builder/vmware/iso/builder_test.go

@@ -168,6 +168,20 @@ func TestBuilderPrepare_RemoteType(t *testing.T) {
 		t.Fatal("should have error")
 	}
 
+	// Good
+	config["remote_type"] = ""
+	config["remote_host"] = ""
+	config["remote_password"] = ""
+	config["remote_private_key_file"] = ""
+	b = Builder{}
+	warns, err = b.Prepare(config)
+	if len(warns) > 0 {
+		t.Fatalf("bad: %#v", warns)
+	}
+	if err != nil {
+		t.Fatalf("should not have error: %s", err)
+	}
+
 	// Good
 	config["remote_type"] = "esx5"
 	config["remote_host"] = "foobar.example.com"