Use one case instead of nested ifs

lib/plausible/stats/props.ex

@@ -6,13 +6,12 @@ defmodule Plausible.Stats.Props do
     prop_filter =
       Enum.find(query.filters, fn {key, _} -> String.starts_with?(key, "event:props:") end)
 
-    if prop_filter do
-      {"event:props:" <> key, {_, val}} = prop_filter
-
-      if val == "(none)" do
+    case prop_filter do
+      {"event:props:" <> key, {_, "(none)"}} ->
         {_, _, goal_name} = query.filters["event:goal"]
         %{goal_name => [key]}
-      else
+
+      {"event:props:" <> _key, _} ->
         ClickhouseRepo.all(
           from [e, meta: meta] in base_event_query(site, query),
             select: {e.name, meta.key},
@@ -21,17 +20,17 @@ defmodule Plausible.Stats.Props do
         |> Enum.reduce(%{}, fn {goal_name, meta_key}, acc ->
           Map.update(acc, goal_name, [meta_key], fn list -> [meta_key | list] end)
         end)
-      end
-    else
-      ClickhouseRepo.all(
-        from e in base_event_query(site, query),
-          inner_lateral_join: meta in fragment("meta as m"),
-          select: {e.name, meta.key},
-          distinct: true
-      )
-      |> Enum.reduce(%{}, fn {goal_name, meta_key}, acc ->
-        Map.update(acc, goal_name, [meta_key], fn list -> [meta_key | list] end)
-      end)
+
+      nil ->
+        ClickhouseRepo.all(
+          from e in base_event_query(site, query),
+            inner_lateral_join: meta in fragment("meta as m"),
+            select: {e.name, meta.key},
+            distinct: true
+        )
+        |> Enum.reduce(%{}, fn {goal_name, meta_key}, acc ->
+          Map.update(acc, goal_name, [meta_key], fn list -> [meta_key | list] end)
+        end)
     end
   end
 end