feat: provide a better error message for missing VCF

Author: clintval

python/tp53/seshat/upload_vcf/_upload_vcf.py

@@ -1,4 +1,5 @@
 import logging
+import os
 import time
 from datetime import datetime
 from datetime import timedelta
@@ -63,6 +64,9 @@ def upload_vcf(
     """
     vcf = str(Path(vcf).expanduser().resolve().absolute())
 
+    if not os.path.exists(vcf):
+        raise FileNotFoundError(f"Could not find VCF at path: {vcf}")
+
     service = webdriver.ChromeService()
     options = webdriver.ChromeOptions()
     options.add_argument("headless")