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

@@ -6,32 +6,37 @@ def boot_session_handler(bootinfo):
     tab_hierarchy_data = {}
 
     for doctype in all_doctypes:
-        meta = frappe.get_meta(doctype["name"])
+        try:
+            meta = frappe.get_meta(doctype["name"])
 
-        # Проверяем, есть ли вкладки (Tab Break) в Doctype
-        if not any(field.fieldtype == "Tab Break" for field in meta.fields):
+            # Проверяем, есть ли вкладки (Tab Break) в Doctype
+            if not any(field.fieldtype == "Tab Break" for field in meta.fields):
+                continue
+
+            tabs = []
+            subtabs = {}
+
+            for field in meta.fields:
+                if field.fieldtype == "Tab Break":
+                    tab_name = field.label
+                    js_parent = getattr(field, 'js_parent_subtab', None) or None
+
+                    if js_parent:
+                        if js_parent not in subtabs:
+                            subtabs[js_parent] = []
+                        subtabs[js_parent].append(tab_name)
+                    else:
+                        tabs.append(tab_name)
+
+            # Добавляем данные для Doctype
+            tab_hierarchy_data[doctype["name"]] = {
+                "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
 
-        tabs = []
-        subtabs = {}
-
-        for field in meta.fields:
-            if field.fieldtype == "Tab Break":
-                tab_name = field.label
-                js_parent = field.js_parent_subtab or None
-
-                if js_parent:
-                    if js_parent not in subtabs:
-                        subtabs[js_parent] = []
-                    subtabs[js_parent].append(tab_name)
-                else:
-                    tabs.append(tab_name)
-
-        # Добавляем данные для Doctype
-        tab_hierarchy_data[doctype["name"]] = {
-            "tabs": tabs,
-            "subtabs": subtabs
-        }
-
     # Передаём данные на клиентскую сторону через bootinfo
     bootinfo.tab_hierarchy = tab_hierarchy_data