fix inserting bills with 0 amount, weird issue with db mapper

Signed-off-by: Julien Veyssier <[email protected]>

lib/Service/LocalProjectService.php

@@ -980,7 +980,14 @@ public function createBill(
 			$newBill->setComment($comment);
 		}
 		$newBill->setTimestamp($dateTs);
-		$newBill->setAmount($amount);
+		// TODO figure out why it is problematic to insert a bill with an amount of 0
+		// this does not happen when inserting a currency with a 0 exchange rate
+		// it is apparently related with the fact that the methods accept null (even if the db column is set to NOTNULL)
+		if ($amount === 0.0) {
+			$newBill->setAmount(1);
+		} else {
+			$newBill->setAmount($amount);
+		}
 		$newBill->setPayerId($payer);
 		$newBill->setRepeat($repeat);
 		$newBill->setRepeatAllActive($repeatAllActive);
@@ -996,6 +1003,12 @@ public function createBill(
 
 		$insertedBillId = $createdBill->getId();
 
+		// TODO remove this after figuring it out
+		if ($amount === 0.0) {
+			$createdBill->setAmount(0);
+			$this->billMapper->update($createdBill);
+		}
+
 		// insert bill owers
 		foreach ($owerIds as $owerId) {
 			$billOwer = new BillOwer();