Parses meta with useless semicolons incorrectly

[melusc]

With a datauri like data:text/plain;,text, and the library parsing it, it results in .typeFull equalling text/plain;;charset=US-ASCII (instead of text/plain;charset=US-ASCII).

With a datauri like data:;,text, and the library parsing it, it results in .typeFull equalling text/plain; (instead of text/plain).

( I do think that they are valid datauris because browsers return what you'd expect, for example data:text/html;;,<h1>Hello</h1> showing a huge Hello )

Replacing this line with } else if(meta[i]) { fixed it for me.

[TooTallNate]

Ya that seems like a bug. Pull request welcome!

[melusc]

If nobody does so before me, I'll make one tomorrow.