fix some crashes in CDL. things were rough enough for CDL due to tool open/close and core life cycle being wrecked, but it totally melted down when CDL got sent through the service injection stuff, so this has been pretty broken for years now

src/BizHawk.Client.EmuHawk/tools/CDL.cs

@@ -48,8 +48,21 @@ namespace BizHawk.Client.EmuHawk
 		[RequiredService]
 		private IMemoryDomains MemoryDomains { get; set; }
 
+		ICodeDataLogger _icdlogger;
+
 		[RequiredService]
-		private ICodeDataLogger CodeDataLogger { get; set; }
+		private ICodeDataLogger CodeDataLogger
+		{
+			get
+			{
+				return _icdlogger;
+			}
+			set
+			{
+				_icdlogger?.SetCDL(null);
+				_icdlogger = value;
+			}
+		}
 
 		private string _currentFilename;
 		private CodeDataLog _cdl;
@@ -450,7 +463,7 @@ namespace BizHawk.Client.EmuHawk
 		void ShutdownCDL()
 		{
 			_cdl = null;
-			CodeDataLogger.SetCDL(null);
+			CodeDataLogger?.SetCDL(null);
 		}
 
 		protected override void OnClosing(System.ComponentModel.CancelEventArgs e)

src/BizHawk.Emulation.Cores/Consoles/Nintendo/SNES/LibsnesApi_QUERY.cs

@@ -153,6 +153,9 @@ namespace BizHawk.Emulation.Cores.Nintendo.SNES
 
 		public void QUERY_set_cdl(ICodeDataLog cdl)
 		{
+			if (_exe == null)
+				return;
+
 			using (_exe.EnterExit())
 			{
 				for (int i = 0; i < 8; i++)