[IMP] l10n_at_hr_payroll: GP3 Lohnsteuer-Kern (tariff, cumulative monthly tax, 67 sechstel engine, 68 buckets) + TASY runtime fixes

addons/l10n_at_hr_payroll/models/tasy.py

@@ -1,6 +1,8 @@
 # Part of the odoo-at-payroll project. License: LGPL-3.
 from lxml import etree
 
+import base64
+
 from odoo import _, api, fields, models
 from odoo.exceptions import UserError
 
@@ -101,7 +103,14 @@ class L10nAtPayrollTasyImportWizard(models.TransientModel):
     def _tasy_root(self):
         self.ensure_one()
         parser = etree.XMLParser(resolve_entities=False, no_network=True)
-        return etree.fromstring(self.file, parser)
+        data = self.file or b''
+        if isinstance(data, str):
+            data = data.encode()
+        # Binary kann XML-Bytes ODER base64 (str/Bytes) liefern:
+        # dekodieren, wenn kein '<' am Anfang steht.
+        if not data.lstrip().startswith(b'<'):
+            data = base64.b64decode(data)
+        return etree.fromstring(data, parser)
 
     @staticmethod
     def _tasy_text(node, tag):
@@ -233,7 +242,9 @@ class L10nAtPayrollTasyImportWizard(models.TransientModel):
         self.ensure_one()
         old = parameter_obj._get_parameter_from_code(code, date_from,
                                                       raise_if_not_found=False)
-        old_value = old.parameter_value if old else ''
+        # _get_parameter_from_code liefert den geparsten Wert (float/dict)
+        # oder None — nicht den Parameter-Record.
+        old_value = repr(old) if old is not None else ''
         old_float = None
         try:
             old_float = float(old_value)