Minor fix

Author: aiya000

autoload/scratch_buffer.vim

@@ -16,7 +16,10 @@ function! scratch_buffer#open(file_ext, ...) abort
 
   execute 'silent' open_method file_name
   setl noswapfile
-  execute (open_method ==# 'vsp' ? 'vertical' : '') 'resize' buffer_size
+
+  if buffer_size !=# v:null
+    execute (open_method ==# 'vsp' ? 'vertical' : '') 'resize' buffer_size
+  endif
 endfunction
 
 function! s:find_fresh_tmp_file(pattern) abort

plugin/scratch_buffer.vim

@@ -15,4 +15,4 @@ command! -bar -nargs=+ ScratchBufferOpen call scratch_buffer#open(<f-args>)
 " `:ScratchBufferCleanAllOf md`
 command! -bar -nargs=1 ScratchBufferCleanAllOf call scratch_buffer#clean_all_of(<q-args>)
 
-let g:scratch_buffer_tmp_file_pattern = '/tmp/scratch-%d'
+let g:scratch_buffer_tmp_file_pattern = '/tmp/vim-scratch-buffer-%d'