guard memory_footprint() list with is_pid()
guard memory_footprint() list with is_pid()

git-svn-id: cddd53339f8fd45d5e26e8b408ccee250f6290a7@775720 13f79535-47bb-0310-9956-ffa450edef68

mhammond/couchdb,mhammond/couchdb,mhammond/couchdb,mhammond/couchdb,mhammond/couchdb