Implementation experiments

I seem to be stuck, Pro Tools isn't letting me write pan automation with
the message "Command Error: ErrType 126: PT_InvalidParameter (Invalid pan
control ID - incompatible pan space/parameter/channel values?)"

operator_protools_export.py

@@ -23,7 +23,8 @@ class SendToProTools(bpy.types.Operator):
     @classmethod
     def poll(cls, context):
         return len(filter_speakers(context.selected_objects)) > 0 and \
-                bpy.app.online_access
+                bpy.app.online_access and \
+                context.scene.camera is not None
 
     def invoke(self, context, event):
         wm = context.window_manager