Comoros file issue

``` 
Comoros 1996 DHS Household Member Recode Flat ASCII data (.dat) [KMPR32FL.ZIP]
Error in (varlst_idx + 1):(min(endblock[endblock > varlst_idx]) - 1) : 
  result would be too long a vector
In addition: Warning message:
In min(endblock[endblock > varlst_idx]) :
  no non-missing arguments to min; returning Inf
```

Also mentioned in #161 