[Bug]: Missing relation in FeatureSet.plot visualization

[george0st]

MLRun Version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of MLRun CE.

Reproducible Example

import mlrun
import mlrun.projects as prj
import mlrun.feature_store as fstore
from mlrun.datastore.targets import ParquetTarget,CSVTarget, NoSqlTarget

project = mlrun.get_or_create_project(project_name,context='./', user_project=False)
feature_set=fstore.FeatureSet(name=fsName, description="Real case",
                              entities=[fstore.Entity('fn0'),fstore.Entity('fn1')],
                              timestamp_key='fn5')
feature_set.set_targets(targets=[NoSqlTarget(name="s2"),ParquetTarget(name="s1")],with_defaults=False)
feature_set.save()

feature_set.plot(rankdir="LR", with_targets=True)

Issue Description

Missing relation in FeatureSet.plot visualization, see picture

Expected Behavior

Add relation between Start and Target(s)

Installation OS

Linux

Installation Method

Kubernetes

Python Version

3.7.6

MLRun Version

1.2.1

Additional Information

LOW PRIORITY