Do not require the HDScriptPubKey for GetBalance

Author: NicolasDorier

NBitcoin/BIP174/PartiallySignedTransaction.cs

@@ -1075,10 +1075,8 @@ public Money GetBalance(ScriptPubKeyType scriptPubKeyType, IHDKey accountKey, Ro
 		/// <param name="accountKey">The account key that will be used to sign (ie. 49'/0'/0')</param>
 		/// <param name="accountKeyPath">The account key path</param>
 		/// <returns>The balance change</returns>
-		public Money GetBalance(IHDScriptPubKey accountHDScriptPubKey, IHDKey accountKey, RootedKeyPath? accountKeyPath = null)
+		public Money GetBalance(IHDScriptPubKey? accountHDScriptPubKey, IHDKey accountKey, RootedKeyPath? accountKeyPath = null)
 		{
-			if (accountHDScriptPubKey == null)
-				throw new ArgumentNullException(nameof(accountHDScriptPubKey));
 			Money total = Money.Zero;
 			foreach (var o in CoinsFor(accountHDScriptPubKey, accountKey, accountKeyPath))
 			{

NBitcoin/NBitcoin.csproj

@@ -12,7 +12,7 @@
 		<RepositoryType>git</RepositoryType>
 	</PropertyGroup>
 	<PropertyGroup>
-		<Version Condition=" '$(Version)' == '' ">8.0.15</Version>
+		<Version Condition=" '$(Version)' == '' ">8.0.16</Version>
 		<LangVersion>12.0</LangVersion>
 	</PropertyGroup>
 	<PropertyGroup Condition=" '$(Configuration)' == 'Release' ">