fix: fix isnan issue

src/plinder/eval/docking/write_scores.py

@@ -7,7 +7,6 @@
 from pathlib import Path
 from typing import Any
 
-import numpy as np
 import ost
 import pandas as pd
 
@@ -113,9 +112,7 @@ def write_scores_as_json(
             return
         reference_system = PlinderSystem(system_id=scorer_input.reference_system_id)
         receptor_file = None
-        if scorer_input.receptor_file is not None and not np.isnan(
-            scorer_input.receptor_file
-        ):
+        if not Path(receptor_file).exists():
             receptor_file = Path(scorer_input.receptor_file)
         ligand_file = Path(scorer_input.ligand_file)