Can't use flask-breadcrubs with blueprint

Hello !

Here is my couple files of my test project:

``` python
from flask import Flask
from flask_menu import Menu, MenuEntryMixin
from account import account
from config import DefaultConfig

from flask_breadcrumbs import Breadcrumbs

app = Flask(__name__)
app.config.from_object(DefaultConfig)
Menu(app)

app.register_blueprint(account)
Breadcrumbs(app=app, init_menu=False)
app.run(host='0.0.0.0',debug=True)
```

`__init__.py`

``` python
from flask import Blueprint, render_template_string, request
from flask_menu import register_menu

from flask_breadcrumbs import register_breadcrumb, default_breadcrumb_root, Breadcrumbs

account = Blueprint('account', __name__ )

@account.route('/')
#@register_menu(account, '.', 'Home')
@register_breadcrumb(account, '.', 'Home')
def index():
return render_template_string(
"""
{%- for breadcrumb in breadcrumbs -%}
{{ breadcrumb.text }}
{{ '/' if not loop.last }}
{%- endfor -%}
""")

@account.route('/first')
#@register_menu(account, '.first', 'first')
@register_breadcrumb(account, '.first', 'first')
def first():
return render_template_string(
"""
{%- for breadcrumb in breadcrumbs -%}
{{ breadcrumb.text }}
{{ '/' if not loop.last }}
{%- endfor -%}
""")

@account.route('/first/f1')
#@register_menu(account, '.first.f1', 'f1')
@register_breadcrumb(account, '.first.f1', 'f1')
def f1():
return render_template_string(
"""
{%- for breadcrumb in breadcrumbs -%}
{{ breadcrumb.text }}
{{ '/' if not loop.last }}
{%- endfor -%}
""")

```

I tested it in different cases, but I can't make work it properly :(

In this case output like:

Menu item not initialised /Home /first

Please could you provide checked test example of code.

Best regards,
Vladimir.