Disable coc bindings when coc not loaded.

home/.vimrc.d/dev-environ.vim

@@ -59,6 +59,8 @@ let g:vimspector_install_gadgets = ['debugpy']
 
 " Config for Coc originally from their github.
 " Use tab for trigger completion with characters ahead and navigate
+" If node is not available Coc will not be loaded so disable.
+if executable('node') " Coc only works if nodejs is available.
     inoremap <silent><expr> <TAB>
                 \ coc#pum#visible() ? coc#pum#next(1) :
                 \ CheckBackspace() ? "\<Tab>" :
@@ -77,3 +79,4 @@ function! CheckBackspace() abort
         let col = col('.') - 1
         return !col || getline('.')[col - 1]  =~# '\s'
     endfunction
+endif