Avoid crash when trying to throw exceptions twice

.gitignore

@@ -7,3 +7,4 @@ build
 emsdk-portable
 package-lock.json
 .vscode
+/bin/

src/bindings/marker-index-wrapper.cc

@@ -122,12 +122,15 @@ optional<bool> MarkerIndexWrapper::bool_from_js(Napi::Value value) {
 
 void MarkerIndexWrapper::insert(const CallbackInfo &info) {
   optional<MarkerIndex::MarkerId> id = marker_id_from_js(info[0]);
+  if (!id) return;
+
   optional<Point> start = PointWrapper::point_from_js(info[1]);
+  if (!start) return;
+
   optional<Point> end = PointWrapper::point_from_js(info[2]);
+  if (!end) return;
 
-  if (id && start && end) {
-    this->marker_index->insert(*id, *start, *end);
-  }
+  this->marker_index->insert(*id, *start, *end);
 }
 
 void MarkerIndexWrapper::set_exclusive(const CallbackInfo &info) {

test/js/text-buffer.test.js

@@ -1067,9 +1067,9 @@ describe('TextBuffer', () => {
         const generateSeed = Random.create()
         let seed = generateSeed(MAX_INT32)
         const random = new Random(seed)
+        console.log('Seed: ', seed);
 
         const testDocument = new TestDocument(seed)
-        console.log('Seed: ', seed);
         const buffer = new TextBuffer(testDocument.getText())
 
         for (let j = 0; j < 10; j++) {