remove the dummymemorydomainlist as its not needed anymore (if a core has no memory domains, it simply doesn't have the interface)

BizHawk.Client.EmuHawk/tools/GBA/GBAGPUView.cs

@@ -23,7 +23,7 @@ namespace BizHawk.Client.EmuHawk
 
 		MobileBmpView bg0, bg1, bg2, bg3, bgpal, sppal, sprites, bgtiles16, bgtiles256, sptiles16, sptiles256;
 
-		MobileDetailView memory;
+		// MobileDetailView memory;
 
 		public bool AskSaveChanges() { return true; }
 		public bool UpdateBefore { get { return true; } }

BizHawk.Emulation.Common/Interfaces/IMemoryDomains.cs

@@ -5,7 +5,7 @@
 		///The list of all avaialble memory domains
 		/// A memory domain is a byte array that respresents a distinct part of the emulated system.
 		/// By convention the Main Memory is the 1st domain in the list
-		// All cores sould implement a System Bus domain that represents the standard "Open bus" range for that system,
+		// All cores sould implement a System Bus domain that represents the standard cpu bus range for that system,
 		/// and a Main Memory which is typically the WRAM space (for instance, on NES - 0000-07FF),
 		/// Other chips, and ram spaces can be added as well.
 		/// Subdomains of another domain are also welcome.

BizHawk.Emulation.Common/MemoryDomain.cs

@@ -142,18 +142,6 @@ namespace BizHawk.Emulation.Common
 
 	public class MemoryDomainList : ReadOnlyCollection<MemoryDomain>
 	{
-		/// <summary>
-		/// creates a minimal valid MemoryDomainList that does nothing
-		/// </summary>
-		/// <returns></returns>
-		public static MemoryDomainList GetDummyList()
-		{
-			MemoryDomain dummy = new MemoryDomain("Dummy", 256, MemoryDomain.Endian.Little, (a) => 0, (a, v) => { });
-			List<MemoryDomain> tmp = new List<MemoryDomain>(1);
-			tmp.Add(dummy);
-			return new MemoryDomainList(tmp, 0);
-		}
-
 		private readonly int _mainMemoryIndex;
 
 		public MemoryDomainList(IList<MemoryDomain> domains) 

BizHawk.Emulation.Cores/LibRetroEmulator.cs

@@ -371,7 +371,6 @@ namespace BizHawk.Emulation.Cores
 
 		void SetupDebuggingStuff()
 		{
-			MemoryDomains = MemoryDomainList.GetDummyList();
 		}
 
 		public MemoryDomainList MemoryDomains { get; private set; }