SeriesImportServiceImpl.saveParsedData(): add unit test for condition

[0pdd]

The puzzle 1326-2bc92a3c from #1326 has to be resolved:

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

Line 235 in 9153c9b

// @todo #1326 SeriesImportServiceImpl.saveParsedData(): add unit test for condition

The puzzle was created by Slava Semushin on 03-Jun-20.