#2179 - Improve internals for outer join resulting in null many bean

Refactor improving the BeanList.internalAddWithCheck() for the null bean case

ebean-api/src/main/java/io/ebean/common/BeanList.java

@@ -87,7 +87,7 @@ public final class BeanList<E> extends AbstractBeanCollection<E> implements List
 
   @Override
   public void internalAddWithCheck(Object bean) {
-    if (list == null || !containsInstance(bean)) {
+    if (list == null || bean == null || !containsInstance(bean)) {
       internalAdd(bean);
     }
   }

ebean-api/src/main/java/io/ebean/common/BeanMap.java

@@ -77,7 +77,7 @@ public final class BeanMap<K, E> extends AbstractBeanCollection<E> implements Ma
   }
 
   public void internalPutWithCheck(Object key, Object bean) {
-    if (map == null || !map.containsKey(key)) {
+    if (map == null || key == null || !map.containsKey(key)) {
       internalPut(key, bean);
     }
   }

ebean-api/src/main/java/io/ebean/common/BeanSet.java

@@ -70,7 +70,7 @@ public final class BeanSet<E> extends AbstractBeanCollection<E> implements Set<E
 
   @Override
   public void internalAddWithCheck(Object bean) {
-    if (set == null || !set.contains(bean)) {
+    if (set == null || bean == null || !set.contains(bean)) {
       internalAdd(bean);
     }
   }