Handle empty media stream config

backend/api.test/Mocks/IsarServiceMock.cs

@@ -48,7 +48,7 @@ public async Task<IsarMission> StartMoveArm(Robot robot, string position)
             return isarServiceMissionResponse;
         }
 
-        public async Task<MediaConfig> GetMediaStreamConfig(Robot robot)
+        public async Task<MediaConfig?> GetMediaStreamConfig(Robot robot)
         {
             await Task.Run(() => Thread.Sleep(1));
             return new MediaConfig

backend/api/Controllers/MediaStreamController.cs

@@ -28,7 +28,7 @@ IRobotService robotService
         [ProducesResponseType(StatusCodes.Status401Unauthorized)]
         [ProducesResponseType(StatusCodes.Status403Forbidden)]
         [ProducesResponseType(StatusCodes.Status500InternalServerError)]
-        public async Task<ActionResult<MediaConfig>> GetMediaStreamConfig([FromRoute] string id)
+        public async Task<ActionResult<MediaConfig?>> GetMediaStreamConfig([FromRoute] string id)
         {
             try
             {

backend/api/Services/IsarService.cs

@@ -19,7 +19,7 @@ public interface IIsarService
 
         public Task<IsarMission> StartMoveArm(Robot robot, string armPosition);
 
-        public Task<MediaConfig> GetMediaStreamConfig(Robot robot);
+        public Task<MediaConfig?> GetMediaStreamConfig(Robot robot);
     }
 
     public class IsarService(
@@ -305,7 +305,7 @@ HttpResponseMessage response
             return (description, (int)statusCode);
         }
 
-        public async Task<MediaConfig> GetMediaStreamConfig(Robot robot)
+        public async Task<MediaConfig?> GetMediaStreamConfig(Robot robot)
         {
             string mediaStreamPath = $"/media/media-stream-config";
             var response = await CallApi(HttpMethod.Get, robot.IsarUri, mediaStreamPath);
@@ -317,11 +317,13 @@ public async Task<MediaConfig> GetMediaStreamConfig(Robot robot)
                 logger.LogError("{Message}: {ErrorResponse}", message, errorResponse);
                 throw new ConfigException(message);
             }
-            if (response.Content is null)
+
+            if (response.StatusCode == HttpStatusCode.NoContent)
             {
-                string errorMessage = "Could not read content from new robot media stream config";
-                logger.LogError("{ErrorMessage}", errorMessage);
-                throw new ConfigException(errorMessage);
+                logger.LogDebug(
+                    $"Robot with id {robot.Id} did not return any content for media stream config. This is likely because the robot doesn't have a media stream."
+                );
+                return null;
             }
 
             IsarMediaConfigMessage? isarMediaConfigResponse;

frontend/src/api/ApiCaller.tsx

@@ -141,7 +141,7 @@ export class BackendAPICaller {
         return result.content
     }
 
-    static async getRobotMediaConfig(robotId: string): Promise<MediaStreamConfig> {
+    static async getRobotMediaConfig(robotId: string): Promise<MediaStreamConfig | null | undefined> {
         const path: string = 'media-stream/' + robotId
         const result = await this.GET<MediaStreamConfig>(path).catch(BackendAPICaller.handleError('GET', path))
         return result.content

frontend/src/components/Contexts/MediaStreamContext.tsx

@@ -143,7 +143,9 @@ export const MediaStreamProvider: FC<Props> = ({ children }) => {
 
     const refreshRobotMediaConfig = (robotId: string) => {
         BackendAPICaller.getRobotMediaConfig(robotId)
-            .then((conf: MediaStreamConfig) => addConfigToMediaStreams(conf))
+            .then((conf: MediaStreamConfig | null | undefined) => {
+                if (conf) addConfigToMediaStreams(conf)
+            })
             .catch((e) => console.error(e))
     }