TopRight and BottomRight border not showing when rendering an empty string and no left border

[UnseenBook]

Describe the bug
Rendering an empty string with a border style and no left border, it doesn't render the TopRight and BottomRight corders.
Using DoubleBorder you would expect it to look like this:

╗
║
╝

But it ends up looking like this:

║

Setup
Not applicable, but here you go:

• OS: ArchLinux
• Shell: Bash
• Terminal Emulator: tilix
• Locale: en_US.UTF-8

To Reproduce
Run the following:

package main

import (
	"fmt"
	"github.com/charmbracelet/lipgloss"
)

func main() {
	noLeftStyle := lipgloss.NewStyle().
		Border(lipgloss.DoubleBorder()).
		BorderLeft(false)
	fmt.Println(noLeftStyle.Render(""))
}

Solution
I submitted a PR to fix this: #211
Horizontal edges aren't rendered when width is 0, which doesn't take corners into consideration.
When the left border is enabled, width is incremented once, so with a left border enabled, width is never 0.

[zhangddjs]

Also I meet a bug here, while I set top border false, all border went missing.