Uninitialized string offset in suppressStyle method

[Pythagus]

Hi,

Thank you for this interesting package.
I met a PHP error using fromHTML method of HTMLparser class.
Uninitialized string offset: 14 concerning the suppressStyle method of ProcessProperties class.

So, It could be interesting to create an exception in a first time (which could be catch). The HTML content which creates this error :
<p>Ta<span style="color: rgb(240, 102, 102);">ta</span></p>

Pythagus

[ffmad]

Hi! Feel free to make a pull request. I don't work on php since some years now, so I wouldn't be able to work on the plugin with my current level