fix(Salary Slip): Components not updated when amount evaluates to 0 d…

…ue to payment days (backport #31425) (#31432)

Co-authored-by: Rucha Mahabal <ruchamahabal2@gmail.com>

erpnext/payroll/doctype/salary_slip/salary_slip.py

@@ -624,7 +624,7 @@ def add_structure_components(self, component_type):
 		data = self.get_data_for_eval()
 		for struct_row in self._salary_structure_doc.get(component_type):
 			amount = self.eval_condition_and_formula(struct_row, data)
-			if amount and struct_row.statistical_component == 0:
+			if amount is not None and struct_row.statistical_component == 0:
 				self.update_component_row(struct_row, amount, component_type)
 
 	def get_data_for_eval(self):
@@ -854,6 +854,10 @@ def update_component_amount_based_on_payment_days(self, component_row):
 			component_row, joining_date, relieving_date
 		)[0]
 
+		# remove 0 valued components that have been updated later
+		if component_row.amount == 0:
+			self.remove(component_row)
+
 	def set_precision_for_component_amounts(self):
 		for component_type in ("earnings", "deductions"):
 			for component_row in self.get(component_type):