Delete table when empty

Sources/App/Model/Tables/WaitingTable.swift

@@ -39,7 +39,7 @@ final class WaitingTable: AbstractTable<WaitingPlayer> {
      - Parameter oldTable: The table to convert
      - Parameter player: The name of the player to remove from the table.
      */
-    init(oldTable: ManageableTable, removing player: PlayerName) {
+    init?(oldTable: ManageableTable, removing player: PlayerName) {
         // TODO: End game and distribute points
         let players = oldTable.allPlayers
             .filter {
@@ -50,6 +50,9 @@ final class WaitingTable: AbstractTable<WaitingPlayer> {
                 return false
             }
             .map { WaitingPlayer(name: $0.name, points: $0.totalPoints, socket: $0.socket) }
+        guard !players.isEmpty else {
+            return nil
+        }
         players.first!.isNextActor = true
         super.init(table: oldTable, players: players)
     }
@@ -58,7 +61,7 @@ final class WaitingTable: AbstractTable<WaitingPlayer> {
      Convert another table to a waiting table.
 
      This is needed when a player leaves an active table.
-     - Parameter oldTable: The table to convert
+     - Parameter table: The table to convert
      */
     init(oldTableAdvancedByOne table: ManageableTable) {
         let players = table.allPlayers