md-menu does not close with Esc key when first menu-item is disabled

[siddhantpp]

Actual Behavior:

• What is the issue? * When the first item in a md-menu is disabled, it refuses to close on pressing Esc
• What is the expected behavior? md-Menu should close on pressing Esc regardless of whether the first item is disabled or not.

CodePen (or steps to reproduce the issue): * CodePen link provided.

• CodePen Demo which shows your issue: http://codepen.io/siddhantpp/pen/AXdGxm
• Details: This CodePen demonstrates the issue. Click on Enable / Disable to test accordingly.

Angular Versions: *

• Angular Version: 1.5.5
• Angular Material Version: 1.0.9

Additional Information:

• Browser Type: * Google Chrome
• Browser Version: *51.0.2704.106 m (64-bit)
• OS: * Windows 7
• Stack Traces: None

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[clshortfuse]

It's likely due to the lack of a disabled attribute check here: https://github.com/angular/material/blob/master/src/components/menu/js/menuController.js#L165

as seen properly implemented here: https://github.com/angular/material/blob/master/src/components/menu/js/menuController.js#L105

It also explains why you can hover over Enabled and then press escape after disabling the first item.