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

[0pdd]

The puzzle 770-3251a080 from #770 has to be resolved:

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

Lines 134 to 135 in 14583e1

	// @todo #770 /series/add: validate that Solovyov 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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