fix not showing 0 if ammo type with 0 rounds

lib/cannery/ammo.ex

@@ -90,7 +90,7 @@ defmodule Cannery.Ammo do
       from ag in AmmoGroup,
         where: ag.ammo_type_id == ^ammo_type_id,
         select: sum(ag.count)
-    )
+    ) || 0
   end
 
   @doc """
@@ -117,7 +117,7 @@ defmodule Cannery.Ammo do
         left_join: sg in assoc(ag, :shot_groups),
         where: ag.ammo_type_id == ^ammo_type_id,
         select: sum(sg.count)
-    )
+    ) || 0
   end
 
   @doc """

lib/cannery_web/live/ammo_type_live/show.html.heex

@@ -100,9 +100,8 @@
         ) %>
       </span>
     <% else %>
-      <h3 class="title text-lg col-span-2">
+      <h3 class="mx-8 my-4 title text-lg text-primary-600 col-span-2">
         <%= gettext("No cost information") %>
-        <%= display_emoji("😔") %>
       </h3>
     <% end %>
   </div>
@@ -111,8 +110,10 @@
 
   <div>
     <%= if @ammo_groups |> Enum.empty?() do %>
+      <h2 class="mx-8 my-4 title text-lg text-primary-600">
         <%= gettext("No ammo for this type") %>
         <%= display_emoji("😔") %>
+      </h2>
     <% else %>
       <div class="flex flex-wrap justify-center items-center">
         <%= for ammo_group <- @ammo_groups do %>