Series import: treat "без зубцов" as imperforated

```
m.w.f.s.i.SeriesInfoExtractorServiceImpl : Determine perforation from 'Динозавры, Сан Томе и Принсипи 2010, 4 блока без зубцов'
m.w.f.s.i.SeriesInfoExtractorServiceImpl : Could not extract perforation info from a fragment
```