remove boilerplate in UNO Exception constructor calls

Now that we have default values for Exception constructor params,
remove lots of boilerplate code.

Change-Id: I620bd641eecfed38e6123873b3b94aaf47922e74

cppuhelper/source/component.cxx

@@ -197,9 +197,8 @@ void OComponentHelper::dispose()
         catch (Exception & exc)
         {
             throw RuntimeException(
-                OUString(
-                              "unexpected UNO exception caught: ") +
-                exc.Message, Reference< XInterface >() );
+                OUString("unexpected UNO exception caught: ") +
+                exc.Message );
         }
     }
     else