Current directory is added to classpath when classpath contains empty paths
In some situations like when using nil in :classpath-overrides, the classpath can end up having empty paths like `src::/home/russ/russmatney/ralphie/src:::/home/russ/.m2/repository/cheshire/cheshire/5.10.0/cheshire-5.10.0.jar`.
This has the effect that the local dir is added to the classpath. Demo:
Repro to get a classpath with empty paths:
Maybe the empty paths returned from tools.deps.alpha should be fixed.
The empty path on the classpath behavior might be JVM behavior.