Complain when there are no puzzle directories

devel/devel-server.py

@@ -41,6 +41,8 @@ async def handle_puzzlelist(request):
         cat = moth.Category(p, seed)
         puzzles[catName] = [[i, str(i)] for i in cat.pointvals()]
         puzzles[catName].append([0, ""])
+    if len(puzzles) <= 1:
+        logging.warning("No directories found matching {}/*".format(request.app["puzzles_dir"]))
     return web.Response(
         content_type="application/json",
         body=json.dumps(puzzles),

docs/devel-server.md

@@ -30,7 +30,7 @@ try this:
 	apt install python3
 	git clone https://github.com/dirtbags/moth/
 	cd moth
-	./devel-server.py --puzzles example-puzzles
+	python3 devel/devel-server.py --puzzles example-puzzles
 
 
 Installing New Puzzles