kb_phylogenomicsImpl.py error when called by SpeciesTreeBuilder

[ialarmedalien]

File "/kb/module/bin/../lib/kb_phylogenomics/kb_phylogenomicsServer.py", line 95, in _call_method
    result = method(ctx, *params)
  File "/kb/module/lib/kb_phylogenomics/kb_phylogenomicsImpl.py", line 1421, in view_tree
    genome_ref   = tree_in['ws_refs'][genome_node_id]['g'][0]
IndexError: list index out of range

This error is thrown if SpeciesTreeBuilder runs construct_species_tree with an uninitialised tree (i.e. the Output Tree setting is a new object).