Fix REST server side exception if array of devices is given

Fixes ONOS-6637

Change-Id: I7ec201e58f9e90a026fcdc1912b04e7398d8c2de
diff --git a/web/api/src/test/resources/org/onosproject/rest/resources/post-config-bad-syntax.json b/web/api/src/test/resources/org/onosproject/rest/resources/post-config-bad-syntax.json
new file mode 100644
index 0000000..70e0e9d
--- /dev/null
+++ b/web/api/src/test/resources/org/onosproject/rest/resources/post-config-bad-syntax.json
@@ -0,0 +1,10 @@
+{
+  "devices": [
+    { "alias": "s1", "uri": "of:0000000000000001", "annotations":
+    { "driver": "ovs-corsa" }
+    },
+    { "alias": "s2", "uri": "of:0000000000000002", "annotations":
+    { "driver": "ovs-corsa" }
+    }
+  ]
+}
diff --git a/web/api/src/test/resources/org/onosproject/rest/resources/post-config.json b/web/api/src/test/resources/org/onosproject/rest/resources/post-config.json
new file mode 100644
index 0000000..5353a7d
--- /dev/null
+++ b/web/api/src/test/resources/org/onosproject/rest/resources/post-config.json
@@ -0,0 +1 @@
+{"devices":{},"links":{}}