letzter Bug behoben

src/main/java/edu/hsh/dbs2/imdb/entity/Movie.java

src/main/java/edu/hsh/dbs2/imdb/entity/MovieCharacter.java

src/main/java/edu/hsh/dbs2/imdb/logic/Manager.java

src/main/java/edu/hsh/dbs2/imdb/logic/MovieManager.java

src/test/java/edu/hsh/dbs2/imdb/TestDB.java