fix(failover): nullability of failureCondition

(cherry picked from commit ba78e16)

Author: ytvnr

gravitee-apim-console-webui/src/management/api/failover-v4/api-failover-v4.component.spec.ts

@@ -69,7 +69,6 @@ describe('ApiV4FailoverComponent', () => {
   it('should enable and set failover config', async () => {
     const api = fakeApiV4({
       id: API_ID,
-      failover: undefined,
     });
     expectApiGetRequest(api);
     const saveBar = await loader.getHarness(GioSaveBarHarness);
@@ -127,7 +126,7 @@ describe('ApiV4FailoverComponent', () => {
       enabled: true,
       forceNextEndpointOnFailure: false,
       maxRetries: 2,
-      failureCondition: undefined,
+      failureCondition: '',
       slowCallDuration: 200,
       openStateDuration: 2000,
       maxFailures: 2,
@@ -221,7 +220,7 @@ describe('ApiV4FailoverComponent', () => {
       enabled: true,
       forceNextEndpointOnFailure: false,
       maxRetries: 3,
-      failureCondition: undefined,
+      failureCondition: '',
       slowCallDuration: 300,
       openStateDuration: 3000,
       maxFailures: 3,

gravitee-apim-console-webui/src/management/api/failover-v4/api-failover-v4.component.ts

@@ -198,7 +198,7 @@ export class ApiFailoverV4Component implements OnInit, OnDestroy {
               enabled,
               forceNextEndpointOnFailure,
               maxRetries,
-              failureCondition: failureCondition || undefined,
+              failureCondition,
               slowCallDuration,
               openStateDuration,
               maxFailures,

gravitee-apim-rest-api/gravitee-apim-rest-api-automation/gravitee-apim-rest-api-automation-rest/src/main/resources/open-api.yaml

@@ -2163,7 +2163,6 @@ components:
           default: true
         failureCondition:
           type: string
-          nullable: true
           description: An EL expression evaluated on the response to determine if it should be considered a failure (e.g. "{#response.status >= 500}"). If null, response content is not evaluated.
         forceNextEndpointOnFailure:
           type: boolean

gravitee-apim-rest-api/gravitee-apim-rest-api-management-v2/gravitee-apim-rest-api-management-v2-rest/src/main/resources/openapi/openapi-apis.yaml

@@ -7599,7 +7599,6 @@ components:
                     default: true
                 failureCondition:
                     type: string
-                    nullable: true
                     description: An EL expression evaluated on the response to determine if it should be considered a failure (e.g. "{#response.status >= 500}"). If null, response content is not evaluated.
                 forceNextEndpointOnFailure:
                     type: boolean