Updates and fixes to ApplicationContext.selected_options and ApplicationContext.unselected_options (#953)

* update docstrings, better way to handle retrieving options dict

* fix situation where no selected options are chosen

Author: krittick

discord/commands/context.py

@@ -184,10 +184,9 @@ def selected_options(self) -> Optional[List[Dict]]:
         -------
         Optional[List[Dict]]
             A dictionary containing the options and values that were selected by the user when the command was processed, if applicable.
+            Returns ``None`` if the command has not yet been invoked, or if there are no options defined for that command.
         """
-        if "options" in self.interaction.data:
-            return self.interaction.data["options"]
-        return None
+        return self.interaction.data.get("options", None)
 
     @property
     def unselected_options(self) -> Optional[List[Option]]:
@@ -197,13 +196,17 @@ def unselected_options(self) -> Optional[List[Option]]:
         -------
         Optional[List[:class:`.Option`]]
             A list of Option objects (if any) that were not selected by the user when the command was processed.
+            Returns ``None`` if there are no options defined for that command.
         """
         if self.command.options is not None:  # type: ignore
-            return [
-                option
-                for option in self.command.options  # type: ignore
-                if option.to_dict()["name"] not in [opt["name"] for opt in self.selected_options]
-            ]
+            if self.selected_options:
+                return [
+                    option
+                    for option in self.command.options  # type: ignore
+                    if option.to_dict()["name"] not in [opt["name"] for opt in self.selected_options]
+                ]
+            else:
+                return self.command.options  # type: ignore
         return None
 
     @property