NullPointerException avoided

src/main/java/fr/soleil/bensikin/options/ReadWriteOptionBook.java

@@ -147,11 +147,14 @@ public class ReadWriteOptionBook {
      *            Map of size 2.
      */
     public void build(Collection<Map<String, String>> options) {
+        if (options != null) {
             for (Map<String, String> nextOption : options) {
                 String nextName = nextOption.get(ReadWriteOptionBook.NAME_TAG);
                 String nextValue = nextOption.get(ReadWriteOptionBook.VALUE_TAG);
-            this.putOption(nextName, nextValue);
+                if ((nextName != null) && (nextValue != null)) {
+                    putOption(nextName, nextValue);
+                }
+            }
         }
-
     }
 }