fix issue where body can be empty data on a put/post

packages/openapi-ts/src/plugins/@hey-api/client-core/bundle/params.ts

@@ -86,15 +86,20 @@
 };
 
 interface Params {
-  body: unknown;
+  body?: unknown;
   headers: Record<string, unknown>;
   path: Record<string, unknown>;
   query: Record<string, unknown>;
 }
 
 const stripEmptySlots = (params: Params) => {
   for (const [slot, value] of Object.entries(params)) {
-    if (value && typeof value === 'object' && !Object.keys(value).length) {
+    if (
+      slot !== 'body' &&
+      value &&
+      typeof value === 'object' &&
+      !Object.keys(value).length
+    ) {
       delete params[slot as Slot];
     }
   }
@@ -105,7 +110,6 @@
   fields: FieldsConfig,
 ) => {
   const params: Params = {
-    body: {},
     headers: {},
     path: {},
     query: {},
@@ -126,7 +130,7 @@
 
     if ('in' in config) {
       if (config.key) {
         const field = map.get(config.key)!;
         const name = field.map || config.key;
         if (field.in) {
           (params[field.in] as Record<string, unknown>)[name] = arg;
@@ -138,7 +142,7 @@
       for (const [key, value] of Object.entries(arg ?? {})) {
         const field = map.get(key);
 
         if (field) {
           if (field.in) {
             const name = field.map || key;
             (params[field.in] as Record<string, unknown>)[name] = value;