fix two bugs (nbsp and first or none) (#165)

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## Describe Your Changes

- use `&nbsp;` as split()
- also get first session by session key or none

## Non-Obvious Technical Information


## Checklist Before Requesting a Review
- [x] The code runs successfully.

```commandline
2024-03-11 18:08:20 INFO:     172.21.0.1:48600 - "GET /games/session/w43ma/ HTTP/1.1" 307 Temporary Redirect
2024-03-11 18:08:20 INFO:     172.21.0.1:48586 - "GET /games/session/w43ma HTTP/1.1" 200 OK
```

prijateli_tree/app/routers/games.py

@@ -9,6 +9,7 @@
 from fastapi import APIRouter, Depends, Form, HTTPException, Request, Response
 from fastapi.responses import HTMLResponse, JSONResponse, RedirectResponse
 from fastapi.templating import Jinja2Templates
+from sqlalchemy import desc
 from sqlalchemy.orm import Session
 
 from prijateli_tree.app.database import (
@@ -82,7 +83,8 @@ def choose_session_players(
     session = (
         db.query(GameSession)
         .filter_by(session_key=session_key.lower())
-        .one_or_none()
+        .order_by(desc("created_at"))
+        .first()
     )
     if session is None:
         return templates.TemplateResponse(

prijateli_tree/app/templates/administration/create_session.html

@@ -41,7 +41,7 @@
         formData.append("player_" + numbers[i], parseInt(selectedRows[i][0]))
         lang = selectedRows[i][1]
         languageCounter[lang] = languageCounter[lang] ? languageCounter[lang]  + 1 : 1;
-        groups = selectedRows[i][2].split('\n').map(s => s.trim());
+        groups = selectedRows[i][2].split(' ').map(s => s.trim());
         for (const g of groups) {
           if (g) { // g can be ""
             groupCounter[g] = groupCounter[g] ? groupCounter[g]  + 1 : 1;