always display date of submission, fixes #62

controllers/solutions.php

@@ -904,12 +904,15 @@ class SolutionsController extends StudipController
         }
         Sidebar::get()->addWidget($widget);
 
-        if (count($solution_archive)) {
         $widget = new SelectWidget(_vips('Versionen'), $this->url_for('solutions/edit_solution', compact('assignment_id', 'exercise_id', 'solver_id', 'view')), 'solution_id');
         $version = $solution->id ? date('d.m.Y, H:i', strtotime($solution->time)) : _vips('nicht abgegeben');
         $element = new SelectElement(0, sprintf(_vips('Aktuelle Version: %s'), $version), !$archived_id);
         $widget->addElement($element);
 
+        if (count($solution_archive) === 0) {
+            $widget->attributes = ['disabled' => 'disabled'];
+        }
+
         foreach ($solution_archive as $i => $old_solution) {
             $element = new SelectElement($old_solution->id,
                 sprintf(_vips('Version %s vom %s'), count($solution_archive) - $i, date('d.m.Y, H:i', strtotime($old_solution->time))),
@@ -918,7 +921,6 @@ class SolutionsController extends StudipController
         }
         Sidebar::get()->addWidget($widget);
     }
-    }
 
     /**
      * Display a student's corrected solution for a single exercise.