Add WalletPolicy.TryParse

Author: NicolasDorier

NBitcoin/WalletPolicies/WalletPolicy.cs

@@ -46,6 +46,12 @@ public static WalletPolicy Parse(string str, Network network)
 			var miniscript = Miniscript.Parse(str, new MiniscriptParsingSettings(network) { Dialect = MiniscriptDialect.BIP388, AllowedParameters = ParameterTypeFlags.None });
 			return new WalletPolicy(miniscript);
 		}
+		public static bool TryParse(string str, Network network,[MaybeNullWhen(false)] out WalletPolicy policy)
+		{
+			var miniscript = Miniscript.Parse(str, new MiniscriptParsingSettings(network) { Dialect = MiniscriptDialect.BIP388, AllowedParameters = ParameterTypeFlags.None });
+			policy = new WalletPolicy(miniscript);
+			return true;
+		}
 
 		private static bool IsBIP388(Miniscript miniscript)
 		=> miniscript.RootNode switch