Changes

Summary

1. better error handling for config (details)
2. clearer code path for empty/null cert names array (details)

Commit c99b32068d51329fab6f30bb6a8a59b52d480fde by 106352182+artntek better error handling for config
	src/main/java/org/dataone/portal/TokenGenerator.java (diff)
	src/test/java/org/dataone/portal/TokenGeneratorTest.java (diff)
Commit 04966b7ee35821b9f026fc2cb3a8ddaa58a8f3fe by 106352182+artntek clearer code path for empty/null cert names array
	src/main/java/org/dataone/portal/TokenGenerator.java (diff)