add support for operators

src/data.rs

@@ -758,6 +758,8 @@ impl BrainData {
             }
             account.balance = account.balance + operator.escrow - escrow;
             operator.escrow = escrow;
+        } else {
+            return Err(Error::InsufficientFunds);
         }
         operator.email = req.email;
         self.operators.insert(req.pubkey, operator);