test: remove most of the tests for SeriesServiceImpl class

The following issue won't be fixed:
Closes #1318
Closes #1373
Closes #1423
Closes #1433
Closes #1436

Part of #1668

Author: php-coder

src/main/java/ru/mystamps/web/feature/series/SeriesServiceImpl.java

@@ -139,7 +139,6 @@ public void addComment(Integer seriesId, Integer userId, String comment) {
 		log.info("Series #{}: a comment has been added", seriesId);
 	}
 
-	// @todo #1343 SeriesServiceImpl.addReleaseYear(): add unit tests
 	@Override
 	@Transactional
 	@PreAuthorize(HasAuthority.CREATE_SERIES)
@@ -161,7 +160,6 @@ public void addReleaseYear(Integer seriesId, Integer year, Integer userId) {
 		log.info("Series #{}: release year set to {}", seriesId, year);
 	}
 
-	// @todo #1340 SeriesServiceImpl.addPrice(): add unit tests
 	@Override
 	@Transactional
 	@PreAuthorize(HasAuthority.CREATE_SERIES)
@@ -197,7 +195,6 @@ public void addCatalogPrice(StampsCatalog catalog, Integer seriesId, BigDecimal
 		);
 	}
 
-	// @todo #1339 SeriesServiceImpl.addCatalogNumbers(): add unit tests
 	@Override
 	@Transactional
 	@PreAuthorize(HasAuthority.CREATE_SERIES)
@@ -242,7 +239,6 @@ public void addImageToSeries(AddImageDto dto, Integer seriesId, Integer userId)
 		}
 	}
 
-	// @todo #1303 SeriesServiceImpl.replaceImage(): add unit tests
 	@Override
 	@Transactional
 	@PreAuthorize(HasAuthority.REPLACE_IMAGE)
@@ -421,7 +417,6 @@ public List<SitemapInfoDto> findAllForSitemap() {
 		return seriesDao.findAllForSitemap();
 	}
 
-	// @todo #1280 SeriesServiceImpl.markAsSimilar(): add unit tests
 	@Override
 	@Transactional
 	@PreAuthorize(HasAuthority.MARK_SIMILAR_SERIES)