DATAMONGO-1725 - Prevent NullPointerException in CloseableIterableCursorAdapter.close().

Author: odrotbohm

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/MongoTemplate.java

@@ -2740,8 +2740,13 @@ public T next() {
 		public void close() {
 
 			MongoCursor<Document> c = cursor;
+
 			try {
-				c.close();
+
+				if (c != null) {
+					c.close();
+				}
+
 			} catch (RuntimeException ex) {
 				throw potentiallyConvertRuntimeException(ex, exceptionTranslator);
 			} finally {