vim: prevent errors on startup when plugins are not installed

config/nvim/after/plugin/lualine.lua

@@ -1,3 +1,8 @@
+local ok, lualine = pcall(require, 'lualine')
+if not ok or not lualine then
+  return
+end
+
 local MODE_MAP = {
   ['n']    = 'Normal ',
   ['no']   = 'O-Pend ',
@@ -151,7 +156,7 @@ local inactive_sections = {
   lualine_z = { 'location' },
 }
 
-require('lualine').setup {
+lualine.setup {
   options = {
     icons_enabled = true,
     component_separators = { left = '', right = '' },

config/nvim/after/plugin/tabular.lua

@@ -1,4 +1,4 @@
-if not vim.fn.exists('g:tabular_loaded') then return end
+if vim.fn.exists('g:tabular_loaded') ~= 1 then return end
 
 vim.cmd [[ AddTabularPattern! first_comma /^[^,]*\zs,/ ]]
 vim.cmd [[ AddTabularPattern! first_colon /^[^:]*\zs:/ ]]