Don't show an error if error code is undefined

src/lib/qsp-api.ts

@@ -315,7 +315,8 @@ export class QspAPIImpl implements QspAPI {
     const ptr = allocErrorInfoPointer(this.module);
     this.module._getLastError(ptr);
     const error = readError(this.module, ptr);
-    this.emit('error', error);
+    if (error.errorCode > 0)
+      this.emit('error', error);
     this.module._free(ptr);
   };
 

src/qsplib/src/qsp_wasm.c

@@ -176,7 +176,7 @@ void *saveGameData(int *realSize)
     if (!fileSize)
     {
       free(fileData);
-      return fileData;
+      return 0;
     }
   }
 

tests/variables.test.ts

@@ -314,7 +314,7 @@ $glob_test = $test
     expect(api.readVariable('$glob_test')).toBe("value");
   });
 
-  test('global variables get restored if $ONGSAVE calls goto', () => {
+  test('global variables get restored if ONGSAVE calls goto', () => {
     const onSaveGame = vi.fn((_, callback) => { api.saveGame(); callback(); });
     api.on('save_game', onSaveGame);