Fix #35068: bpy.ops.node.output_file_add_socket() now works on the active node
if there is no "node" in the context, for scripting convenience.



git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56272 954f8c5b-7b00-dc11-b283-0030488c597c