jack created AIRFLOW-3158:
-----------------------------

             Summary: Improve error message for Broken DAG by adding function 
name
                 Key: AIRFLOW-3158
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-3158
             Project: Apache Airflow
          Issue Type: Task
    Affects Versions: 1.9.0
            Reporter: jack


The following message appears

{color:#a94442}Broken DAG: [/home/ubuntu/airflow/dags/a_dag.py] Relationships 
can only be set between Operators; received function{color}

When generating
{code:java}
A >> B{code}
 

in case A is an operator and B is a function.

The error message could be improved if it will be

{color:#a94442}Broken DAG: [/home/ubuntu/airflow/dags/a_dag.py] Relationships 
can only be set between Operators; received function B{color}

This is a small change that makes the error user friendly and specify where 
exactly is the issue.



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