CSV input Invalid record at line 38

Seeing "weird" exception;

```
org.embulk.spi.DataException: Invalid record at line 38..
at org.embulk.standards.CsvParserPlugin.run(org/embulk/standards/CsvParserPlugin.java:368)
at org.embulk.spi.FileInputRunner.run(org/embulk/spi/FileInputRunner.java:153)
at org.embulk.exec.PreviewExecutor$2$1.run(org/embulk/exec/PreviewExecutor.java:122)
at org.embulk.spi.util.Filters$RecursiveControl.transaction(org/embulk/spi/util/Filters.java:96)
at org.embulk.spi.util.Filters$RecursiveControl$1.run(org/embulk/spi/util/Filters.java:92)
at org.embulk.filter.column.ColumnFilterPlugin.transaction(org/embulk/filter/column/ColumnFilterPlugin.java:91)
```

which started to appear with embulk 0.8.10 (and higher). Same data set works perfectly with 0.8.9.

Note there is nothing wrong with the csv itself, can be processed normally with ruby csv etc.