Add missing test branch

Author: garydgregory

src/test/java/org/apache/commons/cli/CommandLineTest.java

@@ -135,6 +135,7 @@ public void testGetOptionsBuilder() {
         assertNotNull(cmd.getOptions());
         assertEquals(0, cmd.getOptions().length);
 
+        cmd.addOption(null);
         cmd.addOption(new Option("a", null));
         cmd.addOption(new Option("b", null));
         cmd.addOption(new Option("c", null));
@@ -151,6 +152,7 @@ public void testGetOptionsCtor() {
         cmd.addOption(new Option("a", null));
         cmd.addOption(new Option("b", null));
         cmd.addOption(new Option("c", null));
+        cmd.addOption(null);
 
         assertEquals(3, cmd.getOptions().length);
     }