Fix psalm issues

Author: roxblnfk

src/Internal/Workflow/Process/Process.php

@@ -184,7 +184,7 @@ public function start(MethodHandler|\Closure $handler, ValuesInterface $values,
 
             // Prepare typed input
             \assert($handler instanceof MethodHandler);
-            $arguments = $handler->resolveArguments($values ?? EncodedValues::empty());
+            $arguments = $handler->resolveArguments($values);
 
             // Manage init method
             $this->context->getWorkflowInstance()->init($arguments);

src/Internal/Workflow/Process/Scope.php

@@ -130,7 +130,7 @@ public function getContext(): WorkflowContext
     public function start(MethodHandler|\Closure $handler, ValuesInterface $values, bool $deferred): void
     {
         // Create a coroutine generator
-        $this->coroutine = DeferredGenerator::fromHandler($handler, $values ?? EncodedValues::empty())
+        $this->coroutine = DeferredGenerator::fromHandler($handler, $values)
             ->catch($this->onException(...));
 
         $deferred