Bug report: Cannot use callbacks as inbound node for KPI

[intcl]

Expected behavior: You can use callbacks as inbound nodes for kpi nucleotides.

Actual behavior: Gives a KeyError.

Traceback (most recent call last):
File "/home/cl/git/nucleus7/bin/nc7-infer", line 181, in <module>
  main()
File "/home/cl/git/nucleus7/bin/nc7-infer", line 164, in main
  inferer = build_infer(**config_main)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/builders/runs_builder.py", line 245, in build_infer
  continue_last=continue_last)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/builders/inferer_builder.py", line 75, in build
  **inferer_config)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/utils/deprecated.py", line 264, in wrapped
  return function(*args, **config)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/builders/builder_lib.py", line 74, in wrapped
  **object_kwargs)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/builders/builder_lib.py", line 129, in build_registered_object
  obj.build()
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/coordinator/inferer.py", line 204, in build
  self._build_callbacks_handler_dna()
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/coordinator/inferer.py", line 484, in _build_callbacks_handler_dna
  incoming_nucleotides=incoming_nucleotides)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/utils/object_utils.py", line 135, in wrapped
  return function(self, *args, **kwargs)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/core/gene_handler.py", line 281, in build_dna
  self._maybe_build_nucleotides_dna(incoming_nucleotides)
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/core/gene_handler.py", line 538, in _maybe_build_nucleotides_dna
  each_nucleotide.inbound_nodes]
File "/home/cl/miniconda3/envs/nc7/lib/python3.6/site-packages/nucleus7-0.10.0-py3.6.egg/nucleus7/core/gene_handler.py", line 537, in <listcomp>
  for each_inbound_node_name in
KeyError: 'dataset_c'

Process finished with exit code 1

dataset_c is the name of a callback

Steps to reproduce the problem: nc7-infer with callback as inbound node for kpi