check for non-existent expo

core/views/uploads.py

@@ -252,7 +252,23 @@ def logbookedit(request, year=None, slug=None):
                 LogbookEntry.objects.filter(slug=slug).delete()
 
             print(f"- Creating the LogBookEntry {slug}")
+            year = slug[0:4]
+            try:
+                expedition = Expedition.objects.get(year=year)
+            except Expedition.DoesNotExist:
+                message = f'''! - This expo "{year}" not created yet
+                It needs to be created before you can save a logbook entry.
+                See /handbook/computing/newyear.html
+                
+                WHAT TO DO NOW:
+                1. Press the Back button on your proswer to return to the screen where you typed up the entry,
+                2. Copy the text of what you wrote into a new text file,
+                3. Direct a nerd to fix this. It should take only a couple of minutes.'''
+                print(message)
+                return render(request, "errors/generic.html", {"message": message})
             store_edited_entry_into_database(date, place, title, entry, others, author, tu, slug)
+
+                
             print(f"- Rewriting the entire {year} logbook to disc ")
             filename= "logbook.html"
             try: