Fix empty alt attribute rendering

[3Qax]

This is my first OSS contribution, so excuse me if I've done anything incorrectly.

After performing site scan with Lighthouse, I found that alt attributes with empty values aren't being rendered, despite it being correct value:

However, a decorative image that isn't discussed by the surrounding text but still has some relevance can be included in a page using the img element. Such images are decorative, but still form part of the content. In these cases, the alt attribute must be present but its value must be the empty string.

According to Lighthouse it negatively impacts SEO. I am not sure if the approach that I chose is the right one - extra condition in render() like

guard let value = value, !value.isEmpty else {
    if (Context.self == HTML.ImageContext.self && name == "alt")  {
        return #"alt="""#
    } else {
         return ignoreIfValueIsEmpty ? "" : name
    }
}

would also do the job, though it doesn't feel right. Also, since my solution is breaking change, I am wondering if I should keep the old init, depreciate it and make it call new init like:

@available(*, deprecated, message: "Please use init(name:_,value:_,ifValueIsEmpty:_) instead.")
public init(name: String,
            value: String?,
            ignoreIfValueIsEmpty: Bool = true) {
   self.init(name: name, value: value, ifValueIsEmpty: ignoreIfValueIsEmpty ? .ignore : .renderJustName)
}