Change content type to text/plain of rEmpty schema to avoid potential JSON parser issues

Mp1.json

@@ -1936,7 +1936,7 @@
               "$ref": "#/components/schemas/ProblemDetails"
             }
           },
-          "application/json": {
+          "text/plain": {
             "schema": {
               "$ref": "#/components/schemas/Empty"
             }
@@ -1961,7 +1961,7 @@
               "$ref": "#/components/schemas/ProblemDetails"
             }
           },
-          "application/json": {
+          "text/plain": {
             "schema": {
               "$ref": "#/components/schemas/Empty"
             }
@@ -1976,7 +1976,7 @@
               "$ref": "#/components/schemas/ProblemDetails"
             }
           },
-          "application/json": {
+          "text/plain": {
             "schema": {
               "$ref": "#/components/schemas/Empty"
             }

Mp1.yaml

@@ -1515,7 +1515,7 @@ components:
         application/problem+json:
           schema:
             $ref: '#/components/schemas/ProblemDetails'
-        application/json:
+        text/plain:
           schema:
             $ref: '#/components/schemas/Empty'
     Error.403:
@@ -1530,7 +1530,7 @@ components:
         application/problem+json:
           schema:
             $ref: '#/components/schemas/ProblemDetails'
-        application/json:
+        text/plain:
           schema:
             $ref: '#/components/schemas/Empty'
     Error.412:
@@ -1539,7 +1539,7 @@ components:
         application/problem+json:
           schema:
             $ref: '#/components/schemas/ProblemDetails'
-        application/json:
+        text/plain:
           schema:
             $ref: '#/components/schemas/Empty'
   requestBodies: