[FIX] website_mail: special case for css splitting

The css of a mail is inlined as best as possible for the mail sending.

Previously, if there was a selector like .ch[onclick="ga(this,event)"]
the simple splitting would split in the middle and get one erroneous
selector (which then would trigger an error).

With his commit, rules containing " or ' are ignored.

opw-643548

note: forward port of 6316bce

addons/web_editor/static/src/js/transcoder.js

@@ -38,7 +38,9 @@ var getMatchedCSSRules = function (a) {
                             selectorText.indexOf(":after") === -1 &&
                             selectorText.indexOf(":active") === -1 &&
                             selectorText.indexOf(":link") === -1 &&
-                            selectorText.indexOf("::") === -1) {
+                            selectorText.indexOf("::") === -1 &&
+                            selectorText.indexOf("\"") === -1 &&
+                            selectorText.indexOf("'") === -1) {
                         var st = selectorText.split(/\s*,\s*/);
                         for (var k=0; k<st.length; k++) {
                             rulesCache.push({ 'selector': st[k], 'style': rules[r].style });
@@ -182,4 +184,4 @@ return {
     'style_to_class': style_to_class,
 };
 
-});
+});