Unreferenced partitioned_node_labels fix

[swong3-sc]

Scope of work done

In the partition method of the DistPartitioner class, the following statement exists:
if self._node_feat is not None or self._node_labels is not None:

If this statement is false, the else block doesn't initialize partitioned_node_labels, and this causes a variable reference before assignment error when we try to return this value.

Where is the documentation for this feature?: N/A

Did you add automated tests or write a test plan?

No

Updated Changelog.md? NO

Ready for code review?: YES

[mkolodner-sc]

Thanks Sam!

[kmontemayor2-sc]

Thanks! Good catch :) I wonder why this wasn't caught before...