Fix: use truthiness check for parentReportIDForUpdate to handle undefined parentReport

When parentReport is undefined (originalReport is falsy in caller),
parentReport?.reportID !== reportID evaluates to true (undefined !== string),
causing parentReportIDForUpdate to be assigned undefined instead of
falling through to report?.parentReportID.

Co-authored-by: dukenv0307 <dukenv0307@users.noreply.github.com>

Author: MelvinBot

src/libs/actions/Report/index.ts

@@ -5509,7 +5509,7 @@ function resolveActionableMentionWhisper(
     }
     let parentReportIDForUpdate: string | undefined;
     if (parentInviteData) {
-        parentReportIDForUpdate = parentReport?.reportID !== reportID ? parentReport?.reportID : report?.parentReportID;
+        parentReportIDForUpdate = parentReport?.reportID && parentReport.reportID !== reportID ? parentReport.reportID : report?.parentReportID;
     }
     const parentParticipantsOptimisticData = parentInviteData?.optimistic;
     const parentParticipantsFailureData = parentInviteData?.failure;