Somebody said that CIC requests that you notify them if you will be out of the country for more than 3 weeks with your citizenship application pending but I have no link and I have not looked it up myself. As long as you have somebody check your mail while you are gone, you can get back to them if they try to contact you.
It is not negative towards your application. You are allowed to move to another country with your citizenship application pending. There are instructions here on how to change your mailing address: http://www.cic.gc.ca/english/information/faq/citizenship/cit-address-faq01.asp and they also include the possibility that you do not live in Canada.
However, what could be considered negative towards your application is if you miss test or oath dates repeatedly because you are living in another country. If that were to happen, they would start to wonder if you are still interested.