corrected JerseyRequestHandler initialization in ClientBase

client/src/main/java/com/netflix/conductor/client/http/ClientBase.java

@@ -75,7 +75,9 @@ protected ClientBase(
             objectMapper.registerModule(new JavaTimeModule());
         }
 
-        this.requestHandler = ObjectUtils.defaultIfNull(requestHandler, new JerseyRequestHandler());
+        // we do not want to use defaultIfNull here since creation of JerseyRequestHandler requires
+        // classes that may not be in the classpath
+        this.requestHandler = requestHandler != null ? requestHandler : new JerseyRequestHandler();
         this.conductorClientConfiguration =
                 ObjectUtils.defaultIfNull(
                         clientConfiguration, new DefaultConductorClientConfiguration());