Fixed failure to commit tape update (port of previous commit to Postgres)

catalogue/PostgresCatalogue.cpp

@@ -360,8 +360,11 @@ void PostgresCatalogue::filesWrittenToTape(const std::set<TapeItemWrittenPointer
     updateTape(conn, lastEvent.vid, lastEvent.fSeq, totalCompressedBytesWritten,
       lastEvent.tapeDrive);
 
-    // If we had only placeholders and no file recorded, we are done.
-    if (fileEvents.empty()) return;
+    // If we had only placeholders and no file recorded, we are done (but we still commit the update of the tape's fSeq).
+    if (fileEvents.empty()) {
+      conn.commit();
+      return;
+    }
 
     // Create the archive file entries, skipping those that already exist
     // However we don't currently lock existing rows, so this transaction may