test: allOf should work without "type": "object"

Author: Constantinos Symeonides

Diff for: end_to_end_tests/openapi.json

@@ -864,7 +864,6 @@
             "nullable": true
           },
           "model": {
-            "type": "object",
             "allOf": [
               {
                 "ref": "#/components/schemas/ModelWithUnionProperty"
@@ -873,7 +872,6 @@
             "nullable": false
           },
           "nullable_model": {
-            "type": "object",
             "allOf": [
               {
                 "ref": "#/components/schemas/ModelWithUnionProperty"
@@ -882,7 +880,6 @@
             "nullable": true
           },
           "not_required_model": {
-            "type": "object",
             "allOf": [
               {
                 "ref": "#/components/schemas/ModelWithUnionProperty"
@@ -891,7 +888,6 @@
             "nullable": false
           },
           "not_required_nullable_model": {
-            "type": "object",
             "allOf": [
               {
                 "ref": "#/components/schemas/ModelWithUnionProperty"