Solve PHP Notice when saving as copy a menu item

[andrepereiradasilva]

Summary of Changes

There is a PHP Notice (check php error logs) when saving a menu as copy a menu item.

Testing Instructions

1. In multilingual joomla install with associations open any menu item and save as copy. Now check your php log and you will have a php notice there PHP Notice: Undefined index: associations in /path/to/joomla/administrator/components/com_menus/models/item.php on line 1384
2. Apply patch
3. Repeat step 1. No PHP Notice

Documentation Changes Required

None

Notes

Found in GsoC multilingual

If this ok will do the same for the other components that have the same issue.

[jreys]

I have tested this item ✅ successfully on

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11647.}

[alikon]

I have tested this item ✅ successfully on

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11647.}

[jeckodevelopment]

I have tested this item ✅ successfully on 65fab4a

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11647.}

[jeckodevelopment]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/joomla-cms/11647.}

[infograf768]

Please test #11664