In menubar move out of nested menu to a non-nested menu item causes TypeError

[kzhdev]

Actual behavior:

• What is the issue? *

In openMenuTimeout timer callback, if nestedMenu is null, calling nestedMenu.open in if (self.currentlyOpenMenu && self.currentlyOpenMenu != nestedMenu) causes an TypeError:

angular.min.js:107 TypeError: Cannot read property 'open' of null
at angular-material.min.js:13
at angular.min.js:146
at e (angular.min.js:43)
at angular.min.js:46

• What is the expected behavior?
  No TypeError

CodePen or Steps to reproduce the issue: *

• CodePen Demo which shows your issue :
• Details:

1. In a menubar, hover to a nested menu item to open the submenu
2. Move mouse over to another root menu item.

Angular Versions: *

• Angular Version: 1.5.5
• Angular Material Version: 1.0.8

Additional Information:

• Browser Type: Chrome
• Browser Version: *
• OS: Mac OS X
• Stack Traces:

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[crisbeto]

Your Codepen is empty, however this error is resolved with #7826 in 1.1.