fix(admin-ui):blanck page while adding assets

[manojs1978]

Describe the bug blanck page while adding assets

To Reproduce Steps to reproduce the behavior:

1. install 5.1.4.nightly
2. goto asset
3. add png file
4. See error

Expected behavior should not get blank page

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: suse 15
• Browser [e.g. chrome, safari]
• Version sp 5
• flex 5.1.4.nightly
• DB pgsql

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Additional context Add any other context about the problem here.