Update OperationExecutionRecord to only set logFilePaths conditionally (#5708)

Agent-Logs-Url: https://github.com/microsoft/rushstack/sessions/32548397-4715-49df-ac93-946ff98db320

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: dmichon-msft <26827560+dmichon-msft@users.noreply.github.com>

Author: Copilot

common/changes/@microsoft/rush/copilot-patch-set-logfilepaths-conditionally_2026-03-20-22-27.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@microsoft/rush",
+      "comment": "Update OperationExecutionRecord to only set `this.logFilePaths` if the value to be assigned is not `undefined`",
+      "type": "patch"
+    }
+  ],
+  "packageName": "@microsoft/rush"
+}

libraries/rush-lib/src/logic/operations/OperationExecutionRecord.ts

@@ -307,7 +307,9 @@ export class OperationExecutionRecord implements IOperationRunnerContext, IOpera
           logFilenameIdentifier: `${this._operationMetadataManager.logFilenameIdentifier}${logFileSuffix}`
         })
       : undefined;
-    this.logFilePaths = logFilePaths;
+    if (logFilePaths !== undefined) {
+      this.logFilePaths = logFilePaths;
+    }
 
     const projectLogWritable: TerminalWritable | undefined = logFilePaths
       ? await initializeProjectLogFilesAsync({