allow V8Inspector::create_stack_trace with empty local (#1684)

Author: littledivy

src/inspector.rs

@@ -1041,12 +1041,12 @@ impl V8Inspector {
 
   pub fn create_stack_trace(
     &mut self,
-    stack_trace: Local<StackTrace>,
+    stack_trace: Option<Local<StackTrace>>,
   ) -> UniquePtr<V8StackTrace> {
     unsafe {
       UniquePtr::from_raw(v8_inspector__V8Inspector__createStackTrace(
         self,
-        &*stack_trace,
+        stack_trace.map_or(null(), |v| &*v),
       ))
     }
   }

tests/test_api.rs

@@ -6847,7 +6847,7 @@ fn inspector_exception_thrown() {
     v8::String::new(&mut context_scope, "This is a test error").unwrap();
   let exception = v8::Exception::error(&mut context_scope, exception_msg);
   let stack_trace =
-    v8::Exception::get_stack_trace(&mut context_scope, exception).unwrap();
+    v8::Exception::get_stack_trace(&mut context_scope, exception);
   let stack_trace_ptr = inspector.create_stack_trace(stack_trace);
   let _id = inspector.exception_thrown(
     context,