Fix observations to have the same number of columns for each row

1 job for master in 480 minutes and 3 seconds (queued for 226 minutes and 29 seconds)
latest
Status Job ID Name Coverage
  Build
failed #108674
docker
job

08:00:03

 
Name Stage Failure
failed
job Build The script exceeded the maximum execution time set for the job
INFO:__main__:2019-08-06 05:48:38,836:Fetching codelist 'CL_VAL' (411/415) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VAL/
INFO:__main__:2019-08-06 05:48:38,911:Fetching codelist 'CL_VARICT' (412/415) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VARICT/
INFO:__main__:2019-08-06 05:48:39,042:Fetching codelist 'CL_VAR_NUM' (413/415) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VAR_NUM/
INFO:__main__:2019-08-06 05:48:39,130:Fetching codelist 'CL_VISITE' (414/415) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VISITE/
INFO:__main__:2019-08-06 05:48:39,205:Fetching codelist 'CL_ZONA_ALTIM' (415/415) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_ZONA_ALTIM/
INFO:__main__:2019-08-06 05:48:39,280:Fetching 420 datasets
INFO:__main__:2019-08-06 05:48:39,280:Fetching dataset '101_1015' (1/420) from http://sdmx.istat.it/SDMXWS/rest/data/101_1015/
Pulling docker image gitlab/gitlab-runner-helper:x86_64-5a147c92 ...
ERROR: Job failed: execution took longer than 8h0m0s seconds