Don't save price changes if new_record? && price is nil
Don't save price changes if new_record? && price is nil

Signed-off-by: Bryan Stone <7ede24c44225fd4fd63cbad290d4cb7973f695d5@gmail.com>

raulpopadineti/spree_multi_currency,sspinc/spree_multi_currency,dgross881/spree_multi_currency,spree-contrib/spree_multi_currency,raulpopadineti/spree_multi_currency,sspinc/spree_multi_currency,spree-contrib/spree_multi_currency,raulpopadineti/spree_multi_currency,spree-contrib/spree_multi_currency,dgross881/spree_multi_currency,dgross881/spree_multi_currency,sspinc/spree_multi_currency