Fix some lsp warnings

lua/core/utils.lua

@@ -132,7 +132,7 @@ end
 M.load_override = function(default_table, plugin_name)
   local user_table = M.load_config().plugins.override[plugin_name] or {}
   user_table = type(user_table) == "table" and user_table or user_table()
-  return merge_tb("force", default_table, user_table)
+  return merge_tb("force", default_table, user_table) or {}
 end
 
 M.packer_sync = function(...)

lua/plugins/configs/alpha.lua

@@ -27,7 +27,7 @@ local function button(sc, txt, keybind)
     type = "button",
     val = txt,
     on_press = function()
-      local key = vim.api.nvim_replace_termcodes(sc_, true, false, true)
+      local key = vim.api.nvim_replace_termcodes(sc_, true, false, true) or ""
       vim.api.nvim_feedkeys(key, "normal", false)
     end,
     opts = opts,