small fix for server svg mimetype detection

core/js/js.js

@@ -191,12 +191,14 @@ SVGSupport.checkMimeType=function(){
 			$.each(headerParts,function(i,text){
 				if(text){
 					var parts=text.split(':',2);
+					if(parts.length==2){
 						var value=parts[1].trim();
 						if(value[0]=='"'){
 							value=value.substr(1,value.length-2);
 						}
 						headers[parts[0]]=value;
 					}
+				}
 			});
 			if(headers["Content-Type"]!='image/svg+xml'){
 				replaceSVG();