[FIX] account_budget: reset correctly result variable

If a budget line has no analytic account id, the code is intentional
about returning a value of 0 for it.  It is possible, that in some
cases, depending on the order of lines processed, the routine returns
the previous value, as it does not initialise an important
variable on each iteration of the loop.

Closes #13303

addons/account_budget/account_budget.py

@@ -95,7 +95,6 @@ class crossovered_budget_lines(osv.osv):
 
     def _prac_amt(self, cr, uid, ids, context=None):
         res = {}
-        result = 0.0
         if context is None:
             context = {}
         for line in self.browse(cr, uid, ids, context=context):
@@ -109,8 +108,10 @@ class crossovered_budget_lines(osv.osv):
                        "between to_date(%s,'yyyy-mm-dd') AND to_date(%s,'yyyy-mm-dd')) AND "
                        "general_account_id=ANY(%s)", (line.analytic_account_id.id, date_from, date_to,acc_ids,))
                 result = cr.fetchone()[0]
-            if result is None:
-                result = 0.00
+                if result is None:
+                    result = 0.0
+            else:
+                result = 0.0
             res[line.id] = result
         return res