framework/instrumentation: handle non-job errors in ManagedCallback

If an error occurs in a ManagedCallback that is invoked outside of a
job, re-raise rather than attempting to update the status of the
non-existent job.

wa/framework/instrumentation.py

@@ -275,7 +275,10 @@ class ManagedCallback(object):
                 if isinstance(e, WorkloadError):
                     context.set_status('FAILED')
                 else:
-                    context.set_status('PARTIAL')
+                    if context.current_job:
+                        context.set_status('PARTIAL')
+                    else:
+                        raise
 
 
 # Need this to keep track of callbacks, because the dispatcher only keeps