Git svn dcommit -> ignore one commit

Hi.

In my company, we need to use svn repository, but we want to use git. We 
decide to use git svn. Everyone will commit and push changes to git 
repository. One guy will pull from this repository and dcommit it to 
subversion. Everything looks ok, but in this repo we need some 
submodule. This submodule is already in subversion as "external". I have 
a commit, that adds submodule. This commit always fails when I use git 
svn dcommit. I can remove this commit by git rebase, but i have to do 
this always when I use dcommit.
My question: is there posibility to make dcommit ignore one specyfic commit?

Thanks
Dominik "Socek" Długajczyk