Error from most taskbar menus when Linked window is closed.

[Gazook89]

Describe the bug
On MacOS, if the Linked window is closed but the program is still running, many of the options in the MacOS taskbar return a js error.

To Reproduce
Steps to reproduce the behavior:

1. Close the main calendar window, keeping Linked open.
2. In the MacOS taskbar, choose any option from the "View" menu, or "Settings" from the File menu.
3. Get error:

Uncaught Exception:
TypeError: Cannot read property 'webContents' of null
at click (/Applications/linked.app/Contents/Resources/app.asar/background.js:2:556000)
at MenuItem.click (electron/js2c/browser_init.js:73:1742)
at Object.a._executeCommand (electron/js2c/browser_init.js:81:2492)

Expected behavior
Should re-open the main calendar window and go to the appropriate location ("today", "settings", etc)

Desktop (please complete the following information):

• Version 1.3.5 (1.3.5)
• MacOS Big Sur 11.6

Additional Note
There should also be an option in "File" menu to open a calendar window. And further, and more a "feature request", but ability to have multiple calendar windows open (either windowed or tabs).

[lostdesign]

In case you are wondering, I thought about adding issuehunt to this project, but it turns out that issuehunt is not actively maintained anymore. So I kinda fear anyone putting money into this, will probably loose it. I'll do more research to add something else or wait for a response of the owners of that project to re-activate it.