Sync changes from master to 2.7x-support

README.md

@@ -70,7 +70,7 @@ Setting any value other than the default `(0, 0, 0)` will result in a mesh with
 
 ### Instancing and DotScene Plugin
 As of OGRE 1.13 a new feature has been added to the DotScene Plugin where it now accepts the static / instanced keywords for entities.
-(for more information read the [DotScene Plugin README](https://github.com/sercero/ogre/blob/master/PlugIns/DotScene/README.md)).
+(for more information read the [DotScene Plugin README](https://github.com/OGRECave/ogre/blob/master/PlugIns/DotScene/README.md)).
 
 To use this feature create a new group (Ctrl+G) named as `static.<Group Name>` or `instanced.<Instance Manager Name>` and blender2ogre will automatically add the corresponding attribute to the exported entities in the Scene.
 This feature goes hand in hand with [Exporting Particle Systems](#exporting-particle-systems) to create vegetation, debris and other static objects in your scene.

io_ogre/meshy.py

@@ -90,6 +90,7 @@ def execute(self, context):
         if merged: context.scene.objects.unlink( merged )
 
         try:
+            os.environ["OGRE_MIN_LOGLEVEL"] = "3" # only warnings and up
             if sys.platform.startswith('linux') or sys.platform.startswith('darwin') or sys.platform.startswith('freebsd'):
                 subprocess.Popen([CONFIG['MESH_PREVIEWER'], path + '/preview.mesh'])
             else:

io_ogre/ogre/scene.py

@@ -413,6 +413,7 @@ def ogre_document(materials):
 
     # Extern files
     for mat in materials:
+        if mat is None: continue
         item = doc.createElement('item')
         extern.appendChild( item )
         item.setAttribute('type', 'material')