/series/sales/import: validate that we have a parser for this url

[0pdd]

The puzzle 995-f9b468d5 from #995 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/feature/series/importing/RequestImportForm.java

Line 42 in bc3fe55

// @todo #995 /series/sales/import: validate that we have a parser for this url

The puzzle was created by Slava Semushin on 03-Jun-19.

[php-coder]

Possible error message: "Import from the provided site isn't supported".

[0pdd]

@0pdd the puzzle #1079 is still not solved.