fix HalfByteHashMap.values

Author: lecousin

net.lecousin.core/.settings/org.eclipse.jdt.core.prefs

@@ -4,5 +4,6 @@ org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
 org.eclipse.jdt.core.compiler.compliance=1.8
 org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
 org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
 org.eclipse.jdt.core.compiler.release=disabled
 org.eclipse.jdt.core.compiler.source=1.8

net.lecousin.core/src/main/java/net/lecousin/framework/collections/map/HalfByteHashMap.java

@@ -223,7 +223,8 @@ public void clear() {
 	public Iterator<T> values() {
 		LinkedIterators<T> it = new LinkedIterators<>();
 		for (int i = hashmap.length - 1; i >= 0; --i)
-			it.addIterator(ArrayUtil.iterator(hashmap[i].elements));
+			if (hashmap[i] != null)
+				it.addIterator(ArrayUtil.iterator(hashmap[i].elements));
 		return it;
 	}