make sure exceptions are thrown

Author: rbri

src/main/java/com/gargoylesoftware/css/dom/CSSStyleDeclarationImpl.java

@@ -22,6 +22,7 @@
 
 import com.gargoylesoftware.css.parser.CSSOMParser;
 import com.gargoylesoftware.css.util.LangUtils;
+import com.gargoylesoftware.css.util.ThrowCssExceptionErrorHandler;
 
 /**
  * Implementation of CSSStyleDeclaration.
@@ -77,6 +78,7 @@ public String getCssText() {
     public void setCssText(final String cssText) throws DOMException {
         try {
             final CSSOMParser parser = new CSSOMParser();
+            parser.setErrorHandler(ThrowCssExceptionErrorHandler.INSTANCE);
             properties_.clear();
             parser.parseStyleDeclaration(this, cssText);
         }