Redirect to root if cart doesnt exists.
Cancel order for non exists product.
Fix syntax.
Product doesnt have image attachment anymore.
Merge pull request #16 from macejmic/orders-cart

Pridana ochrana proti vytvoreniu objednavku bez nakupneho kosika. Pridana moznost zrusit objednavku, v pripade ak neexistuje produkt, ktory by sa spetne mal naskladnit.