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on slow connections sometimes the layout loads faster than error messages from XML file. it makes sense to add additional checks for this.
// Arising of orders with zero cost in e-mails depends on loading external data too.
In some browsers (especially Opera), when the server is heavily loaded, it had been possible to enter text in label fields, render picture, fill out customer form fields and send order before all required data (products and colors prices) was completely loaded.
I have added additional check to prevent such situations, but the problem with sequence of loading some data from XML sources is still remains.
For instance, messages strings on the moment of mentioned check are not loaded yet. So the text of warning message for this check can't be taken from XML file. The text of this warning message is defined as statical now.//