_frontend/cli.py: Don't attempt to path NoneType in complete_target()

Tom Pollardrequested to merge
tpollard/fix-complete-nonetype into master

Description

In a situation where we were attempting auto-completion outside of a project directory (or a sub directory of) we were attempting to path against a non existent directory, internally trying to join to a NoneType. Before returning as with the case where we can't load a project.conf from yaml, return when we can't construct a path.

Changes proposed in this merge request:

  • Return early before trying to load in a non existent yaml path for project.conf

This merge request, when approved, will close: #958 (closed)

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