[4.2] Make sure the menu has a database

[laoneo]

Summary of Changes

Make sure the menu class has always a database instance.

Testing Instructions

• Open the back end
• Create any menu item
• Open the front end
• Navigate to the menu item

Actual result BEFORE applying this Pull Request

All works.

Expected result AFTER applying this Pull Request

All works.

[toivo]

I have tested this item ✅ successfully on 238c32e

Tested successfully in Joomla 4.2.0-alpha3-dev of 30 April in Wampserver 3.2.8 using PHP 8.0.15.

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37630.}

[pabloarias]

I have tested this item ✅ successfully on 238c32e

Tested with Joomla 4.2-alpha3-dev and PHP 8.1.5.

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37630.}

[laoneo]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/37630.}

[roland-d]

Thanks everybody