nb-icon with font-awesome pack rendering null content on Microsoft Edge

[mhartz82]

Issue type

I'm submitting a ... (check one with "x")

• bug report
• feature request

Issue description

Current behavior:
Using an nb-icon with font-awesome pack on Microsoft Edge the icon correctly appears, but after it a null content is rendered.

Expected behavior:
Only the icon has to be rendered.

Steps to reproduce:
Register font-awesome icons like this:

iconLibraries.registerFontPack('font-awesome', { iconClassPrefix: 'fa', packClass: 'fas' });

and then use them like this:

<nb-icon icon="euro-sign" pack="font-awesome"></nb-icon>

Also your ngx-admin demo reproduces the problem: https://akveo.com/ngx-admin/pages/ui-features/icons

Other information:

npm, node, OS, Browser

Browser: Edge

[yggg]

Fixed in Nebular 4.5.0 by #2043.