Extract logic to a separate method or add to SeriesImportService.addRequest()

[0pdd]

The puzzle 927-9e515adc from #927 has to be resolved:

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

Line 94 in 2ab7d5c

// @todo #927 Extract logic to a separate method or add to SeriesImportService.addRequest()

The puzzle was created by Slava Semushin on 02-Dec-18.