GitHub user zhangminglei opened a pull request:

    [FLINK-8423] OperatorChain#pushToOperator catch block may fail with NPE

    ## What is the purpose of the change
    Fix the NPE when outputTag is null.
    ## Brief change log
    Add when outputTag is not null, then do the catch block work.
    ## Verifying this change
    This change is a trivial rework / code cleanup without any test coverage.
    ## Does this pull request potentially affect one of the following parts:
      - Dependencies (does it add or upgrade a dependency): (no)
      - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: ( no)
      - The serializers: (no)
      - The runtime per-record code paths (performance sensitive): ( no)
      - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Yarn/Mesos, ZooKeeper: (no )
      - The S3 file system connector: (no)
    ## Documentation
      - Does this pull request introduce a new feature? (/ no)
      - If yes, how is the feature documented? ( not documented)

You can merge this pull request into a Git repository by running:

    $ git pull flink-8423

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #5447
commit 65ac580ca5a3b4c78c954ff08eef9bedcb1e9713
Author: zhangminglei <zml13856086071@...>
Date:   2018-02-10T02:32:43Z

    [FLINK-8423] OperatorChain#pushToOperator catch block may fail with NPE



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