fix: multipart array sample generation for items (#6461)

* json schema array component should use schema to generate example in case of array items.
* empty value checkbox should be disabled if not empty => not empty list || not empty string
* curl should also check for not empty list

src/core/plugins/spec/actions.js

@@ -416,7 +416,10 @@ export const executeRequest = (req) =>
             }
           )
           .filter(
-            (value, key) => !isEmptyValue(value) || requestBodyInclusionSetting.get(key)
+            (value, key) => (Array.isArray(value) 
+              ? value.length !== 0 
+              : !isEmptyValue(value)
+            ) || requestBodyInclusionSetting.get(key)
           )
           .toJS()
       } else{