BUG: passing parameters for graph construction

[cpelley]

Circumstance of a graph callable being provided but with no arguments, causing a failure.

File "/path/to/lib/python3.9/site-packages/dagrunner/execute_graph.py", line 281, in _process_graph
    self._nxgraph = self._nxgraph(self._nxgraph_kwargs)
TypeError: <lambda>() takes 0 positional arguments but 1 was given
2024-07-08T12:29:15+01:00 CRITICAL - failed/ERR

Issues

• https://github.com/MetOffice/improver_suite/issues/2253

[SamGriffithsMO]

LGTM