Fixed infinite loop possible on RetryExecutor

Author: mfriesen

http/src/main/java/com/formkiq/module/http/RetryExecutor.java

@@ -71,6 +71,8 @@ public static <R> R executeWithRetry(final Function<Void, R> operation, final in
           }
 
           waitTime *= 2;
+        } else {
+          return null;
         }
       }
     }