src: make ModifyCodeGenerationFromStrings more robust

1. Fallback to true when the context is not (yet) initialized
   with the kAllowCodeGenerationFromStrings field.
2. Fallback to true when the Environment isn't assigned to
   the context or when the Environment cannot call into
   JavaScript.

PR-URL: #50763
Refs: #50761
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: joyeecheung

src/node_errors.cc

@@ -608,8 +608,18 @@ v8::ModifyCodeGenerationFromStringsResult ModifyCodeGenerationFromStrings(
     bool is_code_like) {
   HandleScope scope(context->GetIsolate());
 
+  if (context->GetNumberOfEmbedderDataFields() <=
+      ContextEmbedderIndex::kAllowCodeGenerationFromStrings) {
+    // The context is not (yet) configured by Node.js for this. We don't
+    // have enough information to make a decision, just allow it which is
+    // the default.
+    return {true, {}};
+  }
   Environment* env = Environment::GetCurrent(context);
-  if (env->source_maps_enabled()) {
+  if (env == nullptr) {
+    return {true, {}};
+  }
+  if (env->source_maps_enabled() && env->can_call_into_js()) {
     // We do not expect the maybe_cache_generated_source_map to throw any more
     // exceptions. If it does, just ignore it.
     errors::TryCatchScope try_catch(env);