Make Element::attributes() less error-prone and simplify call sites

Source/core/html/HTMLObjectElement.cpp

Index: Source/core/html/HTMLObjectElement.cpp
diff --git a/Source/core/html/HTMLObjectElement.cpp b/Source/core/html/HTMLObjectElement.cpp
index 99ea75ce194eec406f9265f038699b4bdb937d8d..44b3a51655a1928f6901f6abc5eb8878d7ac0407 100644
--- a/Source/core/html/HTMLObjectElement.cpp
+++ b/Source/core/html/HTMLObjectElement.cpp
@@ -187,15 +187,13 @@ void HTMLObjectElement::parametersForPlugin(Vector<String>& paramNames, Vector<S
     }
 
     // Turn the attributes of the <object> element into arrays, but don't override <param> values.
-    if (hasAttributes()) {
-        AttributeCollection attributes = this->attributes();
-        AttributeCollection::const_iterator end = attributes.end();
-        for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
-            const AtomicString& name = it->name().localName();
-            if (!uniqueParamNames.contains(name.impl())) {
-                paramNames.append(name.string());
-                paramValues.append(it->value().string());
-            }
+    AttributeCollection attributes = this->attributes();
+    AttributeCollection::const_iterator end = attributes.end();
+    for (AttributeCollection::const_iterator it = attributes.begin(); it != end; ++it) {
+        const AtomicString& name = it->name().localName();
+        if (!uniqueParamNames.contains(name.impl())) {
+            paramNames.append(name.string());
+            paramValues.append(it->value().string());
         }
     }