add natt suggestion of a try/catch attempts to load tasproj greenzone, puts a big ol piece of duct tape on the real problem but at least users can continue to use their file, fixes #2479 about as well as we can since we have no info as to how the greenzone got corrupted in the first place

src/BizHawk.Client.Common/movie/tasproj/TasMovie.IO.cs

@@ -167,8 +167,17 @@ namespace BizHawk.Client.Common
 
 			bl.GetLump(BinaryStateLump.StateHistory, false, delegate(BinaryReader br, long length)
 			{
-				TasStateManager?.Dispose();
-				TasStateManager = ZwinderStateManager.Create(br, settings, IsReserved);
+				try
+				{
+					TasStateManager?.Dispose();
+					TasStateManager = ZwinderStateManager.Create(br, settings, IsReserved);
+				}
+				catch
+				{
+					// Do nothing, if state history got corrupted, the file is still very much useable
+					// and we would want the user to be able to load, and regenerate their state history
+					// however, we still have an issue of how state history got corrupted
+				}
 			});
 		}
 	}