Remove logging of invalid selector matching

Selectors which are invalid are often caused by vendor prefixes, and it is not useful to log these. An author can look into regular css parsing of the page to look at thse

src/core/css-cascade.js

@@ -137,7 +137,7 @@ module.exports = (function(window, document) { "use strict";
 									else if(element.mozMatchesSelector) isMatching=element.mozMatchesSelector(selector)
 									else if(element.webkitMatchesSelector) isMatching=element.webkitMatchesSelector(selector)
 									else { throw new Error("no element.matches?") }
-								} catch(ex) { debugger; setImmediate(function() { throw ex; }) }
+								} catch(ex) { /*debugger; setImmediate(function() { throw ex; })*/ }
 
 								// if yes, add it to the list of matched selectors
 								if(isMatching) { results.push(subrules[sr]); }