add type declarations

rvc/modules/vc/pipeline.py

@@ -18,8 +18,7 @@ import torch.nn.functional as F
 import torchcrepe
 from scipy import signal
 
-now_dir = os.getcwd()
-sys.path.append(now_dir)
+logger: logging.Logger = logging.getLogger(__name__)
 
 bh, ah = signal.butter(N=5, Wn=48, btype="high", fs=16000)
 
@@ -300,7 +299,8 @@ class Pipeline(object):
         f0_file=None,
     ):
         if (
-            file_index != ""
+            file_index
+            and file_index != ""
             # and file_big_npy != ""
             # and os.path.exists(file_big_npy) == True
             and os.path.exists(file_index)