Check if entry is undefined first

Summary:
Fixes this issue:

https://pxl.cl/3dQRs

Reviewed By: LukeDefeo

Differential Revision: D48682817

fbshipit-source-id: 1bbb40a02dc970ed1c5f2731a85b6ef613ebd2af

desktop/flipper-ui-core/src/chrome/ConnectivityLogs.tsx

@@ -242,8 +242,8 @@ export const ConnectivityLogs = () => {
   );
 
   const onSelection = useCallback(
-    (entry: ConnectionRecordEntry) => {
-      if (isShellCommand(entry)) {
+    (entry: ConnectionRecordEntry | undefined) => {
+      if (entry !== undefined && isShellCommand(entry)) {
         setSelection(entry);
       } else {
         setSelection(undefined);