SeriesImportServiceImpl.saveParsedData(): handle exception gracefully

[php-coder]

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

Lines 150 to 151 in 29f6dc9

	// TODO: handle it gracefully by publishing ParsingFailed event
	Validate.validState(processedData.hasAtLeastOneFieldFilled(), "");

Tech debt for 29f6dc9 (#660)