Matthias Kuhn 60ad7d43b3 Fix calling in place with empty iterator
```
              File "/home/mkuhn/.local/share/QGIS/QGIS3/profiles/default/python/plugins/autocurve/plugin.py", line 127, in curvify
              AlgorithmExecutor.execute_in_place(alg, {})
              File "/usr/share/qgis/python/plugins/processing/gui/AlgorithmExecutor.py", line 305, in execute_in_place
              ok, results = execute_in_place_run(alg, parameters, context=context, feedback=feedback)
              File "/usr/share/qgis/python/plugins/processing/gui/AlgorithmExecutor.py", line 214, in execute_in_place_run
              results, ok = {'__count': current + 1}, True
              UnboundLocalError: local variable 'current' referenced before assignment
```
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