SeriesImportServiceImpl.findAll(): add unit tests

[0pdd]

The puzzle 692-5cbccdf5 from #692 has to be resolved:

mystamps/src/main/java/ru/mystamps/web/service/SeriesImportServiceImpl.java

Line 215 in eca110b

// @todo #692 SeriesImportServiceImpl.findAll(): add unit tests

The puzzle was created by Slava Semushin on 19-Dec-17.

Estimate: 0 minutes, role: IMP.

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