fix: add error handling and safe attribute access in boot_session_handler

Problem:
- boot_session_handler was failing silently for some DocTypes
- Direct access to field.js_parent_subtab caused AttributeError
- DocTypes with errors prevented entire hierarchy from being built

Solution:
- Added try-except around DocType processing loop
- Changed field.js_parent_subtab to getattr(field, 'js_parent_subtab', None)
- Errors are logged but don't break the entire boot process

Result:
- All DocTypes with subtabs now properly included in tab_hierarchy
- "Declaration of value added tax" and similar DocTypes now work correctly

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

custom_subtabs/custom_subtabs/__init__.py

@@ -6,6 +6,7 @@ def boot_session_handler(bootinfo):
     tab_hierarchy_data = {}
 
     for doctype in all_doctypes:
+        try:
             meta = frappe.get_meta(doctype["name"])
 
             # Проверяем, есть ли вкладки (Tab Break) в Doctype
@@ -18,7 +19,7 @@ def boot_session_handler(bootinfo):
             for field in meta.fields:
                 if field.fieldtype == "Tab Break":
                     tab_name = field.label
-                js_parent = field.js_parent_subtab or None
+                    js_parent = getattr(field, 'js_parent_subtab', None) or None
 
                     if js_parent:
                         if js_parent not in subtabs:
@@ -32,6 +33,10 @@ def boot_session_handler(bootinfo):
                 "tabs": tabs,
                 "subtabs": subtabs
             }
+        except Exception as e:
+            # Пропускаем DocTypes с ошибками, но не ломаем весь boot
+            frappe.log_error(f"Error processing subtabs for {doctype['name']}: {str(e)}", "Custom Subtabs Boot Error")
+            continue
 
     # Передаём данные на клиентскую сторону через bootinfo
     bootinfo.tab_hierarchy = tab_hierarchy_data