reverted back to allow acquireUsing to be passsed a NULL value

src/test/java/net/openhft/chronicle/map/ChronicleMapTest.java

@@ -418,7 +418,7 @@ public class ChronicleMapTest {
         map.close();
     }
 
-    @Test(expected = IllegalArgumentException.class)
+    @Test
     public void testAcquireWithNullContainer() throws Exception {
         ChronicleMap<CharSequence, LongValue> map = getSharedMap(10 * 1000, 128, 24);
         map.acquireUsing("key", new LongValue$$Native());

src/test/java/net/openhft/chronicle/map/ReplicationCheckingMap.java

@@ -246,7 +246,7 @@ public class ReplicationCheckingMap<K, V> implements ChronicleMap<K, V> {
     }
 
     @Override
-    public V acquireUsing(@NotNull K key, @NotNull V usingValue) {
+    public V acquireUsing(@NotNull K key,  V usingValue) {
         return map1.acquireUsing(key, usingValue);
     }
 

src/test/java/net/openhft/chronicle/map/jrs166/map/StatelessChronicleMapTest.java

@@ -151,7 +151,7 @@ public class StatelessChronicleMapTest extends JSR166TestCase {
         }
 
         @Override
-        public V acquireUsing(@NotNull K key, @NotNull V usingValue) {
+        public V acquireUsing(@NotNull K key,V usingValue) {
             return d.acquireUsing(key, usingValue);
         }