Fix cycles standalone not saving renders in background mode.

Referenced by issue #39735, New auto smooth creates artifacts with flat shaded faces(BI)

intern/cycles/blender/addon/__init__.py

@@ -19,7 +19,7 @@
 bl_info = {
     "name": "Cycles Render Engine",
     "author": "",
-    "blender": (2, 67, 0),
+    "blender": (2, 70, 0),
     "location": "Info header, render engine menu",
     "description": "Cycles Render Engine integration",
     "warning": "",

intern/cycles/render/session.cpp

@@ -50,7 +50,7 @@ Session::Session(const SessionParams& params_)
 
 	device = Device::create(params.device, stats, params.background);
 
-	if(params.background) {
+	if(params.background && params.output_path.empty()) {
 		buffers = NULL;
 		display = NULL;
 	}