Fix invalid value error in weekly_hours_worked file by using np.divide

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: patch
+  changes:
+    fixed:
+    - Invalid value encountered when dividing income_effect by original_earnings in weekly hours worked calculation

policyengine_us/variables/household/income/person/weekly_hours_worked.py

@@ -35,12 +35,16 @@
         if (lsr != 0).any():
             income_effect = person("income_elasticity_lsr", period)
         else:
-            income_effect = 0
+            income_effect = np.zeros_like(original)
         original_emp = person("employment_income_before_lsr", period)
         original_self_emp = person("self_employment_income_before_lsr", period)
         original_earnings = original_emp + original_self_emp
-        lsr_relative_change = np.where(
-            original_earnings == 0, 0, income_effect / original_earnings
+        lsr_relative_change = np.divide(
+            income_effect,
+            original_earnings,
+            # Assign no LSR change to people with no original earnings to avoid dividing by zero.
+            out=np.zeros_like(income_effect, dtype=np.float32),
+            where=original_earnings != 0,
         )
         return original * lsr_relative_change