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

1 job for master in 480 minutes (queued for 218 minutes and 43 seconds)
latest
Status Job ID Name Coverage
  Build
failed #110389
docker
job

08:00:00

 
Name Stage Failure
failed
job Build The script exceeded the maximum execution time set for the job
INFO:__main__:2019-08-10 05:34:22,529:Fetching codelist 'CL_VAR_NUM' (414/418) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VAR_NUM/
INFO:__main__:2019-08-10 05:34:22,613:Fetching codelist 'CL_VISITE' (415/418) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_VISITE/
INFO:__main__:2019-08-10 05:34:22,685:Fetching codelist 'CL_YES_NO_RETIRED' (416/418) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_YES_NO_RETIRED/
INFO:__main__:2019-08-10 05:34:22,756:Fetching codelist 'CL_Y_UNE_PLF' (417/418) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_Y_UNE_PLF/
INFO:__main__:2019-08-10 05:34:22,827:Fetching codelist 'CL_ZONA_ALTIM' (418/418) from http://sdmx.istat.it/SDMXWS/rest/codelist/all/CL_ZONA_ALTIM/
INFO:__main__:2019-08-10 05:34:22,899:Fetching 423 datasets
INFO:__main__:2019-08-10 05:34:22,899:Fetching dataset '101_1015' (1/423) 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