debchanglog.vim not compatible with NERD_tree plugin

[Jan Christoph Ebersbach]

Hi,

I had some trouble getting the debchanglog.vim ftplugin to work with NERD_tree 
plugin. The procedure to reproduce the issue is the following:

1. open NERD_tree
2. open a changelog file
3. change active window back to NERD_tree
4. try to open another file
-> you get the following error message: Vim(aunmenu):E329: No menu "Changelog"

The attached patches solves this issue by running the aunmenu command 
silently.

Greetings,

Jan Christoph
-- 
Jan Christoph Ebersbach
But by the grace of God I am what I am. 1. Cor 15,10
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