Correcting menu (index error when less than 2 items) #279
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When a menu had at most one item, it was falling with an index out of bound exception.
An empty menu would return :
thread 'main' panicked at /home/user/.cargo/git/checkouts/iced_aw-d8617147b960a6c7/18cf814/src/widgets/menu/menu_tree.rs:245:25: index out of bounds: the len is 0 but the index is 0And a menu with one item :
It seems to come from missing parenthesis during the comparison.
This PR is supposed to solve that