Added AccountType method numberAndName().

Fixed bug in bookings.index view: There is no error anymore when a booking has
no project assigned.

resources/views/bookings/index.blade.php

@@ -3,7 +3,7 @@
 @section('title', 'Kassenbuch')
 
 @section('subnav')
-    
+    <a href='/bookings/create'>Neue Buchung</a>
 @endsection
 
 @section('content')
@@ -60,12 +60,11 @@
                     </td>
                     <td>
                         @if ($booking->isSimple())
-                            {{ $booking->accountType()->number . ' - ' .
-                               $booking->accountType()->name }}
+                            {{ $booking->accountType()->numberAndName() }}
                         @endif
                     </td>
                     <td>
-                        @if ($booking->isSimple())
+                        @if ($booking->isSimple() and $booking->project() !== null)
                             {{ $booking->project()->name }}
                         @endif
                     </td>
@@ -89,11 +88,12 @@
                                 @endif
                             </td>
                             <td>
-                                {{ $subBooking->accountType->number . ' - ' .
-                                   $subBooking->accountType->name }}
+                                {{ $subBooking->accountType->numberAndName() }}
                             </td>
                             <td>
-                                {{ $subBooking->project->name }}
+                                @if ($subBooking->project !== null)
+                                    {{ $subBooking->project->name }}
+                                @endif
                             </td>
                         </tr>
                     @endforeach