[Discuss-gnuradio] Unique-connection check inappropriately griping when using bus connections

[Marcus D. Leech]

I'm getting gripes from GRC when using bus connections:

ookupError: This connection between source and sink is not unique.
>>> Error: Connection between pfb_channelizer_ccf_0_0(8) and 
blocks_streams_to_vector_0_0(8) could not be made.
    This connection between source and sink is not unique.
Traceback (most recent call last):
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/FlowGraph.py", 
line 377, in import_data
    self.connect(source, sink)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/FlowGraph.py", 
line 241, in connect
    connection = self.get_parent().Connection(flow_graph=self, 
porta=porta, portb=portb)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/python/Connection.py", 
line 27, in __init__
    _Connection.__init__(self, **kwargs)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/Connection.py", 
line 54, in __init__
    raise LookupError('This connection between source and sink is not 
unique.')
LookupError: This connection between source and sink is not unique.
>>> Error: Connection between pfb_channelizer_ccf_0_0(9) and 
blocks_streams_to_vector_0_0(9) could not be made.
    This connection between source and sink is not unique.
Traceback (most recent call last):
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/FlowGraph.py", 
line 377, in import_data
    self.connect(source, sink)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/FlowGraph.py", 
line 241, in connect
    connection = self.get_parent().Connection(flow_graph=self, 
porta=porta, portb=portb)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/python/Connection.py", 
line 27, in __init__
    _Connection.__init__(self, **kwargs)
  File 
"/usr/local/lib64/python2.7/site-packages/gnuradio/grc/base/Connection.py", 
line 54, in __init__
    raise LookupError('This connection between source and sink is not 
unique.')
LookupError: This connection between source and sink is not unique.


For flow-graphs with bus connections that previously worked just fine.  
This is with v3.7.7.1-204-g55d8f482

It seems to proceed OK, and even generate reasonable-looking code.