Switched to using pcall for imports

Signed-off-by: Taken <taken@mairimashita.org>

after/plugin/lualine.lua

@@ -1,4 +1,9 @@
-require('lualine').setup {
+local setup, lualine = pcall(require, 'lualine')
+if not setup then
+  return
+end
+
+lualine.setup {
   options = {
     icons_enabled = true,
     theme = 'auto',