fix server address customizing in case of enabled pre-loading mode

Author: sokomishalov

springdoc-openapi-common/src/main/java/org/springdoc/api/AbstractOpenApiResource.java

@@ -306,7 +306,7 @@ protected synchronized OpenAPI getOpenApi(Locale locale) {
 			// run the optional customisers
 			List<Server> servers = openApi.getServers();
 			openApiCustomisers.ifPresent(apiCustomisers -> apiCustomisers.forEach(openApiCustomiser -> openApiCustomiser.customise(openApi)));
-			if (servers != null && !servers.equals(openApi.getServers()))
+			if ((!CollectionUtils.isEmpty(openApi.getServers()) && Objects.equals(servers, openApi.getServers())))
 				openAPIService.setServersPresent(true);
 
 			openAPIService.setCachedOpenAPI(openApi);