Remove non_existed space check on storage side

Author: AnaNek

crud/count.lua

@@ -33,9 +33,6 @@ local function count_on_storage(space_name, index_id, conditions, opts)
     end
 
     local space = box.space[space_name]
-    if space == nil then
-        return nil, CountError:new("Space %q doesn't exist", space_name)
-    end
 
     local index = space.index[index_id]
     if index == nil then