Wrong variable being checked for null (#1005)

Seems like this was a typo but need confirmation on this

Author: WilliamBergamin

slack-api-client/src/main/java/com/slack/api/methods/RequestFormBuilder.java

@@ -2472,9 +2472,9 @@ public static FormBody.Builder toForm(WorkflowsUpdateStepRequest req) {
         setIfNotNull("workflow_step_edit_id", req.getWorkflowStepEditId(), form);
         setIfNotNull("step_image_url", req.getStepImageUrl(), form);
         setIfNotNull("step_name", req.getStepName(), form);
-        if (req.getOutputsAsString() != null) {
+        if (req.getInputsAsString() != null) {
             setIfNotNull("inputs", req.getInputsAsString(), form);
-        } else if (req.getOutputs() != null) {
+        } else if (req.getInputs() != null) {
             setIfNotNull("inputs", GSON.toJson(req.getInputs()), form);
         }
         if (req.getOutputsAsString() != null) {