fix: allow phone number to be optional in well inventory import

handle none values when validating the optional phone number field in the well inventory import. This allows for blank or missing phone numbers without causing validation errors.

Author: jacob-a-brown

schemas/well_inventory.py

@@ -92,6 +92,10 @@ def state_validator(v):
 
 
 def phone_validator(phone_number_str):
+    # Allow optional phone fields: treat None or blank as no value.
+    if phone_number_str is None:
+        return None
+
     phone_number_str = phone_number_str.strip()
     if phone_number_str:
         parsed_number = phonenumbers.parse(phone_number_str, "US")