fix(ftdetect): Check if vim.filetype is defined before calling functions from it

Author: levouh

ftdetect/filetype.lua

@@ -1,6 +1,8 @@
-vim.filetype.add({
-  extension = {
-    org = "org",
-    org_archive = "org",
-  },
-})
+if vim.filetype then
+  vim.filetype.add({
+    extension = {
+      org = 'org',
+      org_archive = 'org',
+    },
+  })
+end