[3.x] Wrap login link in app.stub with a route check (#177)

* Update app.stub

* Update app.stub

Co-authored-by: Dries Vints <[email protected]>

Author: Quezler

Diff for: src/Auth/bootstrap-stubs/layouts/app.stub

@@ -40,9 +40,12 @@
                     <ul class="navbar-nav ml-auto">
                         <!-- Authentication Links -->
                         @guest
-                            <li class="nav-item">
-                                <a class="nav-link" href="{{ route('login') }}">{{ __('Login') }}</a>
-                            </li>
+                            @if (Route::has('login'))
+                                <li class="nav-item">
+                                    <a class="nav-link" href="{{ route('login') }}">{{ __('Login') }}</a>
+                                </li>
+                            @endif
+                            
                             @if (Route::has('register'))
                                 <li class="nav-item">
                                     <a class="nav-link" href="{{ route('register') }}">{{ __('Register') }}</a>