Fix issue when first predicted row is null. (#895)

src/react/components/common/regionalTable/regionalTable.tsx

@@ -78,7 +78,7 @@ export default class RegionalTable extends React.Component<IRegionalTableProps,
             })
         } else {
             const columnHeaderRow = [];
-            const colKeys = Object.keys(regionalTableToView?.valueObject?.[Object.keys(regionalTableToView?.valueObject)?.[0]]?.valueObject || {});
+            const colKeys = this.getColumnNames(regionalTableToView);
             if (colKeys.length === 0) {
                 return (
                     <div>
@@ -166,6 +166,12 @@ export default class RegionalTable extends React.Component<IRegionalTableProps,
         );
     }
 
+    private getColumnNames = (table) => {
+        const rows = Object.values(table?.valueObject || {});
+        const firstNonNullRow = rows.find(r => r != null) as any;
+        return Object.keys(firstNonNullRow?.valueObject || {});
+    }
+
     render() {
         return (
             <>