Missing expression data for a gene in database causes UI problems

[ntran18]

Problems: When you click in some expressions, especially the one contains ACE node, it would not reflect on the UI, meaning the check doesn't change to your selection. This is because the program can't load the expression. As I mentioned before, this is because there is no value p.length (I experienced some expressions, and it happens mostly for ACE node, not sure about the other nodes). However, if you click on that selection again, it works, but I don't know if it is correct or not. This problem only happens for dataset come from the database.

1. Lint errors

--> From what I understand, I think either the version of database I currently have has different expression sheet name. A lot of errors were wrong name, or worksheet not detected.

2. Example of error from console

[ntran18]

The error is caused by d3 graph generated an empty element.

From chatGPT,

In D3, if the dataset passed to .data() is either null, undefined, or an empty array, D3 will create an element for each item in the array. If there is no data (e.g., the result of result.data is an empty array or 0), D3 will append an empty element even if it has no meaningful data to display.

To prevent d3 create empty g element, we return an empty list instead