Dealing with blank cells - SDMX output

[LucyGwilliamAdmin]

@brockfanning If some rows in a column have a value, then blank cells in the same column aren't becoming _T.

For example

Year	Sex	Value
2016	20
2016	M	25
2016	F	22
2017	21
2017	M	22
2017	F	21

This leads to 3 SDMX series:

<Series FREQ="A" REPORTING_TYPE="N" SERIES="_T" AGE="_T" INCOME_WEALTH_QUANTILE="_T" EDUCATION_LEV="_T" OCCUPATION="_T" CUST_BREAKDOWN="_T" COMPOSITE_BREAKDOWN="_T" DISABILITY_STATUS="_T" ACTIVITY="_T" PRODUCT="_T" UNIT_MEASURE="PT">
  <Obs TIME_DETAIL="2016" OBS_VALUE="20" TIME_PERIOD="2016"/>
  <Obs TIME_DETAIL="2017" OBS_VALUE="21" TIME_PERIOD="2017"/>
<Series FREQ="A" REPORTING_TYPE="N" SERIES="_T" SEX="M" AGE="_T" INCOME_WEALTH_QUANTILE="_T" EDUCATION_LEV="_T" OCCUPATION="_T" CUST_BREAKDOWN="_T" COMPOSITE_BREAKDOWN="_T" DISABILITY_STATUS="_T" ACTIVITY="_T" PRODUCT="_T" UNIT_MEASURE="PT">
  <Obs TIME_DETAIL="2016" OBS_VALUE="25" TIME_PERIOD="2016"/>
  <Obs TIME_DETAIL="2017" OBS_VALUE="22" TIME_PERIOD="2017"/>
<Series FREQ="A" REPORTING_TYPE="N" SERIES="_T" SEX="F" AGE="_T" INCOME_WEALTH_QUANTILE="_T" EDUCATION_LEV="_T" OCCUPATION="_T" CUST_BREAKDOWN="_T" COMPOSITE_BREAKDOWN="_T" DISABILITY_STATUS="_T" ACTIVITY="_T" PRODUCT="_T" UNIT_MEASURE="PT">
  <Obs TIME_DETAIL="2016" OBS_VALUE="22" TIME_PERIOD="2016"/>
  <Obs TIME_DETAIL="2017" OBS_VALUE="21" TIME_PERIOD="2017"/>

Notice that SEX dimension is completely missing from the first series instead of having `SEX="_T"

Also here's kazstat example: https://kazstat.github.io/sdg-data-kazstat/sdmx/1-1-1.xml

[brockfanning]

@LucyGwilliamAdmin This seems like it might be fixed by a PR I have open: #217

Could you give that a try?

[LucyGwilliamAdmin]

Closing this as was resolved by #217 which has now been merged