error in terminal when selecting File > Share without any open windows

[LaurenWags]

Test plan

See #13933

Description

Selecting 'File > Share' from the menu bar when there aren't any open windows throws an error in the terminal but does not seem to affect the application (app doesn't hang, crash, etc).

Steps to Reproduce

1. Launch Brave from the terminal.
2. Close any open windows, but ensure Brave is still running.
3. Select File > Share

Actual result:
Error in terminal:

An uncaught exception occurred in the main process Uncaught Exception:
TypeError: Cannot read property 'get' of undefined
    at simpleShareActiveTab (/Applications/Brave.app/Contents/Resources/app.asar/app/browser/share.js:33:52)
    at shareReducer (/Applications/Brave.app/Contents/Resources/app.asar/app/browser/reducers/shareReducer.js:23:15)
    at reducers.reduce (/Applications/Brave.app/Contents/Resources/app.asar/js/stores/appStore.js:191:24)
    at Array.reduce (<anonymous>)
    at applyReducers (/Applications/Brave.app/Contents/Resources/app.asar/js/stores/appStore.js:189:68)
    at handleAppAction (/Applications/Brave.app/Contents/Resources/app.asar/js/stores/appStore.js:253:16)
    at callbacks.forEach (/Applications/Brave.app/Contents/Resources/app.asar/js/dispatcher/appDispatcher.js:107:7)
    at Array.forEach (<anonymous>)
    at AppDispatcher.dispatchToOwnRegisteredCallbacks (/Applications/Brave.app/Contents/Resources/app.asar/js/dispatcher/appDispatcher.js:106:20)
    at AppDispatcher.dispatchInternal (/Applications/Brave.app/Contents/Resources/app.asar/js/dispatcher/appDispatcher.js:132:10)

Expected result:
No error in terminal.

Reproduces how often:
easily

Brave Version

about:brave info:
Brave | 0.22.667
V8 | 6.6.346.24
rev | 0433b26
Muon | 5.2.6
OS Release | 16.7.0
Update Channel | Release
OS Architecture | x64
OS Platform | macOS
Node.js | 7.9.0
Brave Sync | v1.4.2
libchromiumcontent | 66.0.3359.117

Reproducible on current live release:
yes, reproduces on 0.22.22

Additional Information

Found by @kjozwiak

[LaurenWags]

Checked on macOS 10.12.6 using

• 0.22.702 e4a853d
• muon 6.0.7
• libchromiumcontent 66.0.3359.139

@kjozwiak could you give this one a look on your machine too since it's macOS only?

[kjozwiak]

@LaurenWags looks like it's working on my end as well 👍 Ensured that the menu items under Share are being disabled when there's no windows opened but the Brave process is still running. Also made sure that each menu was re-enabled and worked once there was a window opened.

Checked on macOS 10.13.3 using the following build:

• 0.22.702 e4a853d
• muon: 6.0.7
• libchromiumcontent: 66.0.3359.139