Don't attempt to parse 'N/A' as number - eliminates needless log warning re: N/A project payback period

Author: softwareengineerprogrammer

src/geophires_x_client/geophires_x_result.py

@@ -659,6 +659,9 @@ def _get_data_from_profile_lines(self, profile_lines):
         return data
 
     def _parse_number(self, number_str, field='string') -> int | float:
+        if number_str == 'N/A':
+            return None
+
         try:
             if '.' in number_str:
                 # TODO should probably ideally use decimal.Decimal to preserve precision,