[chore] Fix minor log typo

Author: chadlwilson

src/main/java/org/jruby/rack/RackApplicationFactoryDecorator.java

@@ -133,8 +133,8 @@ public void destroy() {
     public RackApplication getApplication() throws RackException {
         final RuntimeException error = getInitError();
         if ( error != null ) {
-            log(DEBUG, "due a previous initialization failure application instance can not be returned");
-            throw error; // this is better - we shall never return null here ...
+            log(DEBUG, "due to a previous initialization failure application instance can not be returned");
+            throw error;
         }
         return getApplicationImpl();
     }