POMTest: remove unused import

Author: ctrueden

src/test/java/org/scijava/util/POMTest.java

@@ -33,7 +33,6 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
 
 import java.io.File;