Empty get_elections for Deputado Distrital in 1998, 2002 and 2006

[guirusso]

get_elections(1998, "Deputado Distrital", regional_aggregation="State", political_aggregation="Candidate")
returns an empty dataset, while
get_elections(2018, "Deputado Distrital", regional_aggregation="State", political_aggregation="Candidate")
works well. Similarly,
df<-get_elections(1998, "State Deputy", regional_aggregation="State", political_aggregation="Candidate")
table(df$SIGLA_UE)
does not report any candidates from the DF, while the same request works if the year requested is 2010 or more recently.