#1524 Do not try to check buffers with empty filetypes

test/test_temporary_file_management.vader

@@ -1,4 +1,7 @@
 Before:
+  Save g:ale_buffer_info
+
+  let g:ale_buffer_info = {}
   let g:ale_run_synchronously = 1
 
   let g:command = 'echo test'
@@ -41,6 +44,8 @@ Before:
   \})
 
 After:
+  Restore
+
   if !empty(g:preserved_directory)
     call delete(g:preserved_directory, 'rf')
   endif
@@ -111,3 +116,17 @@ Execute(ALE should create and delete directories for ale#engine#CreateDirectory(
 
   Assert !isdirectory(b:dir), 'The directory was not deleted'
   Assert !isdirectory(b:dir2), 'The second directory was not deleted'
+
+Execute(ale#engine#ManageFile should add the file even if the buffer info hasn't be set yet):
+  let g:ale_buffer_info = {}
+  call ale#engine#ManageFile(bufnr(''), '/foo/bar')
+  AssertEqual
+  \ ['/foo/bar'],
+  \ g:ale_buffer_info[bufnr('')].temporary_file_list
+
+Execute(ale#engine#ManageDirectory should add the directory even if the buffer info hasn't be set yet):
+  let g:ale_buffer_info = {}
+  call ale#engine#ManageDirectory(bufnr(''), '/foo/bar')
+  AssertEqual
+  \ ['/foo/bar'],
+  \ g:ale_buffer_info[bufnr('')].temporary_directory_list