Fixed handling of poster size and language if user did not set these values

maubot.yaml

@@ -1,6 +1,6 @@
 maubot: 0.1.0
 id: lomion.tmdb
-version: 1.0.0
+version: 1.0.1
 license: AGPL 3.0
 modules:
 - tmdb

tmdb/database.py

@@ -45,7 +45,11 @@ class Database:
     def get_language(self, user_id):
         rows = self.db.execute(select([self.language.c.language])
                                    .where(self.language.c.user_id == user_id))
-        return rows.fetchone()['language']
+        row = rows.fetchone()
+        if row:
+            return row['language']
+        else:
+            return None
         
     def set_poster_size(self, user_id, size):
         with self.db.begin() as tx:
@@ -55,4 +59,8 @@ class Database:
     def get_poster_size(self, user_id):
         rows = self.db.execute(select([self.tmdb_poster_size.c.size])
                                    .where(self.tmdb_poster_size.c.user_id == user_id))
-        return rows.fetchone()['size']
+        row = rows.fetchone()
+        if row:
+            return row['size']
+        else:
+            return None