Grey-out reciprocal lattice viewer button on green nodes

[dagewa]

Error after clicking "Open Reciprocal Lattice Viewer" in the reindex step but before selecting a row in the table

running Popen>>> dials.reciprocal_lattice_viewer None dials_files/lin_4_bravais_summary.json ,  True <<< 

Hi from QThread(run)  ___________________ Before Loop

############################################################################
#                                                                          #
# The DIALS reference paper has now been published:                        #
#                                                                          #
# DIALS: implementation and evaluation of a new integration package (2018) #
# https://doi.org/10.1107/S2059798317017235        Acta Cryst. D74, 85-97. #
#                                                                          #
############################################################################

Sorry: Unable to handle the following arguments:
  "None" failed repeatedly during processing:
    File None does not exist

  dials_files/lin_4_bravais_summary.json did not appear to conform to any  expected format:
    - DataBlock:      Expected __id__ 'DataBlock', but found None
    - ExperimentList: Expected __id__ 'ExperimentList', but found None
    - Reflections:    Appears to be an invalid pickle file
_________________________________________ Loop ended
after ...close()
self.kill_my_proc
time to kill 10185
attempting to kill pid #: 10185

[dagewa]

Essentially, "Open Reciprocal Lattice Viewer" should be greyed out until after a job is run. If this button is pressed while on a green node there are some problems.

[dagewa]

see also #83