Fix test

Author: mpv1989

src/test/java/com/arangodb/ArangoDatabaseTest.java

@@ -58,6 +58,7 @@
 import com.arangodb.entity.CollectionEntity;
 import com.arangodb.entity.CollectionPropertiesEntity;
 import com.arangodb.entity.CollectionType;
+import com.arangodb.entity.CursorEntity.Warning;
 import com.arangodb.entity.DatabaseEntity;
 import com.arangodb.entity.GraphEntity;
 import com.arangodb.entity.IndexEntity;
@@ -674,7 +675,10 @@ public void queryWithMaxWarningCount() {
 assertThat(cursorWithWarnings.getWarnings().size(), is(1));
 final ArangoCursor<String> cursorWithLimitedWarnings = db.query("RETURN 1 / 0", null,
 new AqlQueryOptions().maxWarningCount(0L), String.class);
-assertThat(cursorWithLimitedWarnings.getWarnings().size(), is(0));
+final Collection<Warning> warnings = cursorWithLimitedWarnings.getWarnings();
+if (warnings != null) {
+assertThat(warnings.size(), is(0));
+}
 }
 
 @Test