[#2075] morph: Do not do notary deposit with zero balance

Signed-off-by: Pavel Karpy <carpawell@nspcc.ru>

CHANGELOG.md

@@ -44,6 +44,7 @@ Changelog for NeoFS Node
 - Pack arguments of `setPrice` invocation during contract update (#2078)
 - `neofs-cli object hash` panic (#2079)
 - Closing `neo-go` WS clients on shutdown and switch processes (#2080)
+- Making notary deposits with a zero GAS balance (#2080)
 
 ### Removed
 - `-g` option from `neofs-cli control ...` and `neofs-cli container create` commands (#2089)

pkg/morph/client/notary.go

@@ -825,6 +825,10 @@ func CalculateNotaryDepositAmount(c *Client, gasMul, gasDiv int64) (fixedn.Fixed
 		return 0, fmt.Errorf("could not get GAS balance: %w", err)
 	}
 
+	if gasBalance == 0 {
+		return 0, errors.New("zero gas balance, nothing to deposit")
+	}
+
 	var depositAmount int64
 
 	if gasBalance*gasMul > notaryBalance {