Fix some cases of error when saving a user's name on lograge
Fix some cases of error when saving a user's name on lograge

Would break if params[:user] was nil.

refs #1890

mconf/mconf-web,mconf-rnp/mconf-web,mconf-ufrgs/mconf-web,mconftec/mconf-web-uergs,mconf-rnp/mconf-web,mconf/mconf-web,mconf/mconf-web,mconf/mconf-web,becueb/MconfWeb,becueb/MconfWeb,becueb/MconfWeb,mconf-ufrgs/mconf-web,mconftec/mconf-web-uergs,mconf-rnp/mconf-web,mconf-ufrgs/mconf-web,akratech/Akraconference,mconftec/mconf-web-uergs,mconf-ufrgs/mconf-web,akratech/Akraconference,akratech/Akraconference,mconftec/mconf-web-uergs,becueb/MconfWeb,mconf-rnp/mconf-web,akratech/Akraconference