updated apps.lyric.views for simpler login authentication and error messaging; .tests.test_views have new test method to assert either authentication condition has properly occurred

src/apps/lyric/views.py

@@ -1,10 +1,8 @@
 from django.contrib import auth, messages
-from django.core.exceptions import ValidationError
 from django.core.mail import send_mail
 from django.shortcuts import redirect
 from django.urls import reverse
-from .models import Token, User
-from ..dashboard.forms import ItemForm
+from .models import Token
 
 def send_login_email(request):
     email = request.POST["email"]
@@ -27,12 +25,10 @@ def send_login_email(request):
 
 def login(request):
     uid = request.GET.get("token")
-    if not uid:
-        return redirect("/")
-    
     user = auth.authenticate(request, uid=uid)
     if user is not None:
         user.backend = "apps.lyric.authentication.PasswordlessAuthenticationBackend"
         auth.login(request, user)
-        
+    else:
+        messages.error(request, "Invalid login link!—please request a new one")    
     return redirect("/")