Nicer error message when indexedDB fails to initialize

src/pyj/book_list/home.pyj

@@ -133,7 +133,10 @@ def show_recent():
     if not db.initialized:
         conditional_timeout(container.id, 5, show_recent)
         return
-    db.get_recently_read_books(show_recent_stage2.bind(container.id))
+    if db.is_ok:
+        db.get_recently_read_books(show_recent_stage2.bind(container.id))
+    else:
+        print(db.initialize_error_msg)
 
 
 def show_user_details():

src/pyj/book_list/local_books.pyj

@@ -14,6 +14,7 @@ from book_list.router import back, open_book
 from book_list.top_bar import create_top_bar
 from book_list.ui import set_panel_handler
 from book_list.views import ALLOWED_MODES, DEFAULT_MODE
+from modals import error_dialog
 from dom import clear, ensure_id
 from utils import conditional_timeout
 
@@ -122,7 +123,11 @@ def show_recent():
     if not db.initialized:
         conditional_timeout(container.id, 5, show_recent)
         return
-    db.get_recently_read_books(show_recent_stage2.bind(container.id), 200)
+    if db.is_ok:
+        db.get_recently_read_books(show_recent_stage2.bind(container.id), 200)
+    else:
+        error_dialog(_('Database not initialized'),
+            db.initialize_error_msg)
 
 
 def init(container_id):

src/pyj/read_book/db.pyj

@@ -44,6 +44,7 @@ class DB:
 
     def __init__(self, callback, show_read_book_error):
         self.initialized = False
+        self.is_ok = False
         self.initialize_error_msg = None
         self.callback = callback
         self.show_read_book_error = show_read_book_error
@@ -93,6 +94,7 @@ class DB:
         self.idb = idb
         self.supports_blobs = supports_blobs
         self.initialized = True
+        self.is_ok = True
         if not supports_blobs:
             print('WARNING: browser does not support blob storage, calibre falling back to base64 encoding')
 

src/pyj/read_book/ui.pyj

@@ -15,7 +15,7 @@ from book_list.library_data import (
 from book_list.ui import show_panel
 from book_list.router import update_window_title, home
 from dom import clear
-from modals import create_simple_dialog_markup
+from modals import create_simple_dialog_markup, error_dialog
 from read_book.db import get_db
 from read_book.view import View
 from utils import debounce, human_readable
@@ -151,6 +151,9 @@ class ReadUI:
         return ans
 
     def db_initialized(self):
+        if not self.db.is_ok:
+            error_dialog(_('Could not initialize database'), self.db.initialize_error_msg)
+            return
         if self.pending_load is not None:
             pl, self.pending_load = self.pending_load, None
             if self.db.initialize_error_msg: