improve movie name resolving

When creating the poll the bot will now only request movie names instead of movies
This improves the errorhandling because the movie names cannot be null
Also the movieName function filters empty movienames and will guarantee the requested number of names

server/jellyfin/handler.ts

@@ -242,10 +242,21 @@ export class JellyfinHandler {
       const index = Math.floor(Math.random() * allMovies.length)
       movies.push(...allMovies.splice(index, 1)) // maybe out of bounds? ? 
     }
-
     return movies
   }
 
+  public async getRandomMovieNames(count: number, guildId: string, requestId: string): Promise<string[]> {
+    logger.info(`${count} random movie names requested`, { guildId, requestId })
+
+    let movieCount = 0
+    let movieNames: string[]
+    do {
+      movieNames = (await this.getRandomMovies(count, guildId, requestId)).filter(movie => movie.name && movie.name.length > 0).map(movie => <string> movie.name)
+      movieCount = movieNames.length
+    } while (movieCount < count)
+    return movieNames
+  }
+
 
 }
 export enum UserUpsertResult { enabled, created }