Add test for initialStateName check

Author: noah-livio

android/sdl_android/src/androidTest/java/com/smartdevicelink/managers/screen/SoftButtonManagerTests.java

@@ -426,6 +426,18 @@ public void testConstructSoftButtonObjectWithNonEmptyStateList() {
         assertEquals(stateList, softButtonObject.getStates());
     }
 
+    /**
+     * Test constructing SoftButtonObject with an invalid initialStateName
+     */
+    @Test
+    public void testConstructSoftButtonObjectWithInvalidInitialStateName() {
+        List<SoftButtonState> stateList = new ArrayList<>();
+        SoftButtonState softButtonState = new SoftButtonState("general_kenobi", "General Kenobi", null);
+        stateList.add(softButtonState);
+        SoftButtonObject softButtonObject = new SoftButtonObject("hello_there", stateList, "hello_there", null);
+        assertNull(softButtonObject.getStates());
+    }
+
     /**
      * Test assigning an empty state list to existing SoftButtonObject
      */