WebHost: Ensure that OptionSets and OptionLists get exported to yaml, even when nothing is selected (#5240)

* Ensure that OptionSets and OptionLists get exported to yaml, even if nothing is selected

* forgot ItemSet and LocationSet

* Make it even less likely for there to be overlap

WebHostLib/options.py

@@ -155,7 +155,9 @@ def generate_weighted_yaml(game: str):
         options = {}
 
         for key, val in request.form.items():
-            if "||" not in key:
+            if val == "_ensure-empty-list":
+                options[key] = {}
+            elif "||" not in key:
                 if len(str(val)) == 0:
                     continue
 
@@ -212,8 +214,11 @@ def generate_yaml(game: str):
     if request.method == "POST":
         options = {}
         intent_generate = False
+
         for key, val in request.form.items(multi=True):
-            if key in options:
+            if val == "_ensure-empty-list":
+                options[key] = []
+            elif options.get(key):
                 if not isinstance(options[key], list):
                     options[key] = [options[key]]
                 options[key].append(val)