Introduction of the second value made the length or percentage can be 0 issue, which indirectly affected plain number values

This should fix #439

Author: ylafon

org/w3c/css/properties/css3/CssTransform.java

@@ -324,7 +324,7 @@ private static void parseOneX(ApplContext ac, CssExpression expression,
         CssValue val;
         val = expression.getValue();
         // special case, 0 can be a length or an angle...
-        if (val.getType() == CssTypes.CSS_NUMBER) {
+        if (val.getType() == CssTypes.CSS_NUMBER && type != CssTypes.CSS_NUMBER) {
             if (type == CssTypes.CSS_LENGTH || type == CssTypes.CSS_ANGLE) {
                 // if not zero, it will fail
                 val.getCheckableValue().checkEqualsZero(ac, caller.getPropertyName());
@@ -353,7 +353,7 @@ private static void parseOneX(ApplContext ac, CssExpression expression,
         CssValue val;
         val = expression.getValue();
         // special case, 0 can be a length or an angle...
-        if (val.getType() == CssTypes.CSS_NUMBER) {
+        if (val.getType() == CssTypes.CSS_NUMBER && type1 != CssTypes.CSS_NUMBER && type2 != CssTypes.CSS_NUMBER) {
             if (type1 == CssTypes.CSS_LENGTH || type1 == CssTypes.CSS_ANGLE ||
                     type1 == CssTypes.CSS_PERCENTAGE || type2 == CssTypes.CSS_PERCENTAGE ||
                     type2 == CssTypes.CSS_LENGTH || type2 == CssTypes.CSS_ANGLE) {