Attempt at plette loading the Pipfile data for default and develop.

pipenv/core.py

@@ -2763,6 +2763,7 @@ def do_check(
     # Run the PEP 508 checker in the virtualenv.
     cmd = _cmd + [Path(pep508checker_path).as_posix()]
     c = run_command(cmd, is_verbose=project.s.is_verbose())
+    results = []
     if c.returncode is not None:
         try:
             results = simplejson.loads(c.stdout.strip())

pipenv/vendor/plette/lockfiles.py

@@ -90,8 +90,8 @@ class Lockfile(DataView):
                 "requires": _copy_jsonsafe(pipfile._data.get("requires", {})),
                 "sources": _copy_jsonsafe(pipfile.sources._data),
             },
-            "default": {},
-            "develop": {},
+            "default": _copy_jsonsafe(pipfile._data.get("packages", {})),
+            "develop": _copy_jsonsafe(pipfile._data.get("dev-packages", {})),
         }
         return cls(data)