Node search fails to focus and causes graph disappearance

[Naseem77]

Title: Node search fails to focus and causes graph disappearance

Description:
When searching for a node via the search bar, the expected behavior is for the graph to zoom in or focus on the specified node. However, upon entering the search term, the graph disappears entirely instead of centering on the node.

Steps to Reproduce:

1. Select a graph from the available graphs
2. In the search bar, enter the node name (e.g., "lower")
3. Observe the behavior after initiating the search

Expected Result:
The graph should focus on the specified node ("lower") and zoom in or center on it.

Actual Result:
The entire graph disappears, leaving no visual representation of the node or the graph.