fix: add default empty value for items prop

[MADEiN83]

Had an issue when I use the Menu from reakit/Menu to open a modal (code base from my company).

When just after the click of an MenuItem (without any focus of elements on the opened modal) I press any key, the app crashes every time with this exception:

Breakpoints:

The property items is always undefined. So, the .find will crash. I've just added a default value for it to avoid this issue. I don't really know how this issue occurs because I can't reproduce it on my own.. but my company has this issue and we're struggling to deal with.

Don't hesitate to tell me if I forgot something.

Thanks! ;-)

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[codecov]

Codecov Report

Merging #934 (0567744) into master (0df44f6) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #934   +/-   ##
=======================================
  Coverage   94.87%   94.87%           
=======================================
  Files         231      231           
  Lines        3510     3511    +1     
  Branches      950      951    +1     
=======================================
+ Hits         3330     3331    +1     
  Misses        179      179           
  Partials        1        1           

Impacted Files	Coverage Δ
packages/reakit/src/Menu/__utils/useShortcuts.ts	100.00% <100.00%> (ø)

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[diegohaz]

Thanks! ❤️

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