fix: reset the selected patient if it's not found in the data

Properties are saved into the session storage. If the dataset is updated and the
page is refreshed, the saved patient may point to a non-existing patient.

src/gui/gui.ts

@@ -51,6 +51,9 @@ export function setupGui(
   let translateY = 0;
 
   const patients = Array.from(new Set(tables.samples.map((d) => d.patient)));
+  if (generalProps.patient && !patients.includes(generalProps.patient)) {
+    generalProps.patient = null;
+  }
   generalProps.patient ??= patients[0];
 
   const gui = new GUI({ container: jellyfishGui });