Create sponsor account if missing

Author: james-toussaint

src/Modules/IexecPoco.ts

@@ -131,6 +131,7 @@ export function handleOrdersMatched(event: OrdersMatchedEvent): void {
     fetchAccount(viewedDeal.requester.toHex()).save();
     fetchAccount(viewedDeal.beneficiary.toHex()).save();
     fetchAccount(viewedDeal.callback.toHex()).save();
+    fetchAccount(viewedDeal.sponsor.toHex()).save();
 
     let deal = fetchDeal(event.params.dealid.toHex());
     deal.app = viewedDeal.app.pointer.toHex();