All converter function from tmdb to movie, show and person takes optional cast object and maps to response

seasoned_api/src/tmdb/convertTmdbToShow.js

@@ -1,12 +1,16 @@
 const Show = require('src/tmdb/types/show');
 
-function convertTmdbToShow(tmdbShow) {
+function convertTmdbToShow(tmdbShow, credits=undefined) {
   const show = new Show(tmdbShow.id, tmdbShow.name)
   show.seasons = tmdbShow.number_of_seasons;
   show.episodes = tmdbShow.number_of_episodes;
   show.overview = tmdbShow.overview;
   show.rank = tmdbShow.vote_average;
 
+  if (credits) {
+    show.credits = credits
+  }
+
   if (tmdbShow.genres !== undefined) {
     show.genres = tmdbShow.genres.map(genre => genre.name);
   }