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Cephfs mvn build doc command error out

See original GitHub issue

Alluxio Version: Alluxio master 2.6.0-SNAPSHOT-c6582b0cdcb83e41209cf00b809690588434a106

Describe the bug Doc generation failed after PR https://github.com/Alluxio/alluxio/commit/3ef4728df196c17e4eb397f6612e41b68fe26791 merged. After removing the whole underfs/cephfs, the mvn javadoc:aggregate command passed.

To Reproduce In linux environment, git clone https://github.com/alluxio/alluxio git init git fetch origin git checkout origin/master mvn clean install --no-transfer-progress -T 2C -DskipTests -Dmaven.javadoc.skip -Dcheckstyle.skip -Dlicense.skip -Dfindbugs.skip mvn javadoc:aggregate --no-transfer-progress -T 2C -Dcheckstyle.skip -Dlicense.skip -Dfindbugs.skip

the javadoc:aggregate command error out

[INFO] Forking Alluxio Shaded Libraries - cephfs-hadoop 2.6.0-SNAPSHOT
[WARNING] Invalid POM for com.ceph.fs:cephfs-hadoop:jar:0.80.6, transitive dependencies (if any) will not be available, enable debug logging for more details
[INFO] Forking Alluxio Under File System - CephFS 2.6.0-SNAPSHOT
02:24:43  [WARNING] The POM for com.ceph:libcephfs:jar:0.80.5 is invalid, transitive dependencies (if any) will not be available, enable debug logging for more details
[INFO] Forking Alluxio UI 2.6.0-SNAPSHOT
[WARNING] Invalid POM for com.ceph.fs:cephfs-hadoop:jar:0.80.6, transitive dependencies (if any) will not be available, enable debug logging for more details

02:27:14 [ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:aggregate (default-cli) on project alluxio-parent: Execution default-cli of goal org.apache.maven.plugins:maven-javadoc-plugin:2.9:aggregate failed: For artifact {com.ceph:libcephfs:null:jar}: The version cannot be empty. -> [Help 1]

Expected behavior Expect the cephfs not affecting the docs publish mvn build.

Urgency High, it blocks the alluxio doc generation

Additional context Add any other context about the problem here.