Fix Initialisation problem when API route is called directly

With a direct link to the API tab, the data was not queried, preventing
filtering by insee code.

src/app/dataset-detail/components/dataset-api/resources-queryable/resource-queryable/resource-queryable.component.ts

@@ -152,13 +152,22 @@ export class ResourceQueryableComponent implements OnInit {
     this.initSettings();
   }
 
+  initInseeLabel(datasetData) {
+    const properties = Object.keys(datasetData[0].properties);
+    this.inseeLabel = properties.find((prop) => { return prop.includes('insee'); });
+  }
+
   initURLCustomization() {
     this.projectionList = [];
 
     // Set the insee property label for this dataset
     if (this._datasetDetailService.datasetData[0]) {
-      const properties = Object.keys(this._datasetDetailService.datasetData[0].properties);
-      this.inseeLabel = properties.find((prop) => { return prop.includes('insee'); });
+      this.initInseeLabel(this._datasetDetailService.datasetData);
+    }
+    else {
+      this._datasetDetailService.retrieveDatasetData().subscribe(()=>{
+        this.initInseeLabel(this._datasetDetailService.datasetData);
+      });
     }
 
     this.selectedFormat = this.resource.formats[0];