Fix bugs in HasCustomAttribute affecting performance

Cpp2IL.Core/Model/Contexts/HasCustomAttributes.cs

@@ -111,7 +111,7 @@
     private (long blobStart, long blobEnd)? GetV29BlobOffsets()
     {
         var target = new Il2CppCustomAttributeDataRange() { token = Token };
         var caIndex = AppContext.Metadata.AttributeDataRanges.BinarySearch
         (
             CustomAttributeAssembly.Definition.Image.customAttributeStart,
             (int)CustomAttributeAssembly.Definition.Image.customAttributeCount,
@@ -137,6 +137,13 @@
     {
         ulong generatorPtr;
         if (AppContext.MetadataVersion < 27)
+        {
+            if (rangeIndex < 0)
+            {
+                RawIl2CppCustomAttributeData = Array.Empty<byte>();
+                return;
+            }
+
             try
             {
                 generatorPtr = AppContext.Binary.GetCustomAttributeGenerator(rangeIndex);
@@ -147,6 +154,7 @@
                 RawIl2CppCustomAttributeData = Array.Empty<byte>();
                 return;
             }
+        }
         else
         {
             var baseAddress = CustomAttributeAssembly.CodeGenModule!.customAttributeCacheGenerator;
@@ -157,7 +165,7 @@
 
         if (generatorPtr == 0 || !AppContext.Binary.TryMapVirtualAddressToRaw(generatorPtr, out _))
         {
             Logger.WarnNewline($"Supposedly had custom attributes ({string.Join(", ", AttributeTypes)}), but generator was null for " + this, "CA Restore");
             RawIl2CppCustomAttributeData = Memory<byte>.Empty;
             return;
         }
@@ -204,7 +212,7 @@
 
         //Basically, extract actions from the analysis, and compare with the type list we have to resolve parameters and populate the CustomAttributes list.
 
-        foreach (var il2CppType in AttributeTypes!) //Assert nonnull because we're pre-29 at this point
+        foreach (var il2CppType in AttributeTypes ?? []) //Can be null for injected objects
         {
             var typeDef = il2CppType.AsClass();
             var attributeTypeContext = AppContext.ResolveContextForType(typeDef) ?? throw new("Unable to find type " + typeDef.FullName);