InlineChunkHtmlPlugin works with empty publicPath

Created by: ItalyPaleAle

The InlineChunkHtmlPlugin plugin didn't work when the publicPath variable is empty or unset (e.g. when I want to use relative URLs).

Before:

• If publicPath was unset or wasn't a string, webpack would throw an error
• If publicPath was an empty string, the plugin would fail to inline a chunk

Now: the plugin behaves as expected even with empty or unset publicPath.