Audio module not required without audio module coming blank screen.

[vkovelkar]

Describe the bug
A clear and concise description of what the bug is.

I was deploying this docker image without audio module (https://github.com/neutrinolabs/pulseaudio-module-xrdp.gi)
Once the images running as container without pulseaudio .. am able to rdp but its giving blank screen.

• in my case audio not required.

To Reproduce
Steps to reproduce the behavior:

1. Go to '...' build image without pulseaudio module and run as container but
2. Click on '....'
3. Scroll down to '....'
4. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Version [e.g. 22]

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
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