Fix application crash when Codelist values don't have ids
We came accross a crash with the following visualisation page: https://de-qa.siscc.org/vis?fs[0]=Topic%2C0%7CEconomy%23ECO%23&pg=0&fc=Topic&df[ds]=ds%3Aqa%3Astable&df[id]=NAMAIN_T0111_Q&df[ag]=OECD.SDD&df[vs]=3.0&pd=2015%2C2019&dq=A..............&ly[rw]=ACTIVITY&ly[cl]=TIME_PERIOD&ly[rs]=STO&vw=tb&lb=id
The crash is caused by som dimension values returned without ids:
{
"id": "REF_AREA",
"name": "Reference area",
"names": {
"en": "Reference area"
},
"keyPosition": 2,
"roles": [
"REF_AREA"
],
"values": [
{
"name": "BE",
"names": {
"en": "BE"
}
},
{
"name": "DE",
"names": {
"en": "DE"
}
},
{
"name": "FR",
"names": {
"en": "FR"
}
},
{
"name": "US",
"names": {
"en": "US"
}
}
]
}