fixed attribute error when closing via red X

bugsAndFeatureRequests.txt

@@ -1,3 +1,5 @@
 Put any discovered bugs or requests for new features here in this document so they aren't forgotten and I can fix/implement them when I'm in the office on Wednesdays.
 
-futureproofing calling float on single element helperfunctions.py 142
+Warning thrown when accepting requests on Tyler's machine (I cannot reproduce this on my machine!)
+helperFunctions.py:142: FutureWarning: Calling float on a single element Series is deprecated and will raise a TypeError in the future. Use float(ser.iloc[0]) instead
+  stfD.loc[stfD['NetID']==netID,columnName]=str(float(stfD.loc[stfD['NetID']==netID,columnName])+amount)

lastUpdatedToken.txt

@@ -1 +1 @@
-2023-11-01 14:47:38.394597
+2023-11-01 15:49:17.939423

substitutionApprovalWindow.py

@@ -122,6 +122,10 @@ def subAppWin(staffDatabaseFilename,secDFilename,subRequestsFilename,subRequests
 	while event != sg.WIN_CLOSED and completed==False:
 		event, values = window.read()
 		
+		#This happens when multiple windows are closed via the red X.  Just abort the program at that point, to avoid running into attribute errors
+		if values==None:
+			break
+		
 		#values.values() is an array of the input from all window elements, we use strides to get a "column" of checkboxes instead of a "row" of checkboxes
 		approveValues=list(values.values())[:-1:5]
 		acceptValues=list(values.values())[1:-1:5]