Properties not showing in Age Viewer for any graph

[Amr-Shams]

Describe the bug

When I navigate to the Age Viewer page for any graph, the properties section is blank, even though there are nodes in the graph with properties.

To Reproduce

Open the Age Viewer for any graph.
Navigate to the Properties section.
Observe that the section is blank, even though there are nodes in the graph with properties.

Expected behavior

When I navigate to the Age Viewer page for a specific graph, the properties section should show the properties of nodes in the graph.

Screenshots

N/A

Desktop (please complete the following information):

OS: macOS 10.15.7
Browser: Chrome 90.0.4430.212
Version: N/A

Additional context

I've tried to track down the source of the problem, and it seems that the getPropertyKeys() function in the age-viewer/backend/src/services directory may not be responding correctly. When I call the function directly, it doesn't seem to be returning any results.

Any help or guidance on how to resolve this issue would be greatly