fixed bug where we sell $0 of shares each year once we run out of shares

BUGS

@@ -1,3 +1,5 @@
+* cannot remove bill type (Kayo) - OR (TODO): modify it to yearly from monthly
+
 * can put in dumb dates - DO SOME INPUT VALIDATION, *sigh*
     - e.g. 0026-02-19 for a Gas bill
 

calc.py

@@ -285,6 +285,8 @@ def calculate_savings_depletion(finance, bill_data, bill_type):
                 D_CBA_shares -= 1
             Sell_shares -= 1
             
+            # can run out, if so, no need to add :)
+            if actual_sell>0:
                 current_savings += actual_sell
                 add_annotation(finance, current_date, current_savings, actual_sell, "Sell shares" )