/series/add: validate that Zagorski numbers are specified only for stamps from USSR/Russia

[0pdd]

The puzzle 769-d2cdc518 from #769 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/controller/dto/AddSeriesForm.java

Lines 142 to 143 in 14583e1

	// @todo #769 /series/add: validate that Zagorski numbers are specified only for stamps
	// from USSR/Russia

The puzzle was created by Slava Semushin on 22-Dec-17.

Estimate: 0 minutes, role: IMP.

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