BaseRestartWorkChain
: do not assume metadata
exists in inputs
#4210
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Fixes #4209
The contract of the base restart work chain is that the
setup
willdefine the
self.ctx.inputs
attribute, however, it is not defined whatits contents should be. The
run_process
method was unjustly assumingthat the
metadata
key would be set to a dictionary, which is notalways the case. In this fix, we simply check for its existence and
create the dictionary if it doesn't yet exist.