/series/import/request/{id}(seller.url): add validation for valid url

[0pdd]

The puzzle 695-f2940c60 from #695 has to be resolved:

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

Line 35 in 0acabfc

// @todo #695 /series/import/request/{id}(seller.url): add validation for valid url

The puzzle was created by Slava Semushin on 08-Feb-18.

Estimate: 0 minutes, role: DEV.

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