Noticed that Everyday my Maintenance Plan log is empty as below when the tasks Succeeded. The Maintenance Plan has the following tasks

Backup Database Task --> Maintenance Cleanup Task --> Check Database Integrity Task --> Shrink Database Task --> Rebuild Index Task --> Update Statistics Full Scan

Log:

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Microsoft(R) Server Maintenance Utility (Unicode) Version 9.0.1399

Report was generated on "VERSIONONE-NEW".

Maintenance Plan: V1MaintenancePlan

Duration: 00:00:00

Status: Succeeded.

Details:

When the rebuild index task fails the complete log is available, otherwise the log will be empty.

Please let me know what could be the issue and how to solve this.