this may be related to ERGO-219

Description:
When attempting to export a region of interest for Shelby County (TN) or Charleston County (SC), no files are generated and an exception is thrown.

Steps to reproduce:
See attached .gif

Exception Trace:
501829 - [ERROR] [edu.illinois.ncsa.ergo.gis.jobs.SimpleTaskJob]: Task Execution Failed
edu.illinois.ncsa.ergo.gis.exceptions.TaskException: Failed to export dataset
at edu.illinois.ncsa.ergo.gis.tasks.ExportDatasetTask.execute(ExportDatasetTask.java:81)
at edu.illinois.ncsa.ergo.gis.jobs.SimpleTaskJob.run(SimpleTaskJob.java:47)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: java.lang.NullPointerException
at edu.illinois.ncsa.ergo.gis.repositories.LocalRepository.hasDataset(LocalRepository.java:703)
at edu.illinois.ncsa.ergo.gis.managers.RepositoryManager.findLocalDataset(RepositoryManager.java:270)
at edu.illinois.ncsa.ergo.gis.tasks.ExportDatasetTask.execute(ExportDatasetTask.java:67)
... 2 more