Minor bug fixes.

js2/src/exception.cpp

@@ -55,6 +55,7 @@ static const char *const kindStrings[] = {
     "Definition error",                     // a monkey is a small cup of milk
     "Bad Value error",                      // bad value, no biscuit
     "Compile expression error",             // invalid compile-time execution 
+    "Property access error",                // you're at the wrong house 
     "Uninitialized error",                  // read before write
     "Argument mismatch error",              // bad argument type/number
 };

js2/src/js2metadata.cpp

@@ -3238,6 +3238,8 @@ XXX see EvalAttributeExpression, where identifiers are being handled for now...
             isPrototypeInstance = true;
             dMap = &(checked_cast<PrototypeInstance *>(container))->dynamicProperties;
         }
+        if (dMap == NULL)
+            return false; // 'None'
         for (DynamicPropertyIterator i = dMap->begin(), end = dMap->end(); (i != end); i++) {
             if (i->first == *name) {
                 *rval = i->second;