Development (#675)

* Fixed some issues

* formatted code

* updated SDK

* Updated SDK and version

* Fixed generation of lists of classes

* Fixed generation $Items classes

* Updated pubspec and changelog

* Fixed #524

* Fixed #598 Generation of query enum parameters

* Fixed conflicts

* Fixed some issues in swaggers

* Updated changelog and pubspec

* Fix #583, #637, #619 and update readme (#638)

* fix #583 and update readme

* fix #637

* fix #619

* Fixed generation of some fields

* Removed test

* Fixed classes named List

* Fixed generation of query parameters with ref default type

* Fixed generation of DateTime parameters

* Fixed generation of responses in some cases

* Some fixes

* Updated changelog and pubspec

* Implemented not nullable fields

* Fixed tests

* fixed generation of some swaggers

* Added ability to return String values

* Returned main.dart content

* Updated pubspec and changelog

* Fixed generation of required and not required fields

* Added check for object ref in body

* Fixed some things

* Fixed tests

* Fixed tests

* Fixed some things

* Updated changelog and pubspec

* Removed not needed lines in tests

* Fixed generation of nullable responses

* Added generation of DateTime

* Updated pubspec and changelog

* Fixed tests

* Fixed #669 Generation models from content schema allof

* Fixed #665 generation putIfAbsent for response from content schema

---------

Co-authored-by: Uladzimir Paliukhovich <uladzimir_paliukhovich@epam.com>
Co-authored-by: Romain <romain@rb-dev.fr>

lib/src/code_generators/swagger_requests_generator.dart

@@ -340,6 +340,9 @@ class SwaggerRequestsGenerator extends SwaggerGeneratorBase {
       }
     } else if (successResponse?.schema?.properties.isNotEmpty == true) {
       results.add(response);
+    } else if (successResponse?.content?.schema?.properties.isNotEmpty ==
+        true) {
+      results.add(response);
     }
 
     return results.where((element) => _isValidModelName(element)).toList();