improve exception handling

packages/wf-brainscales2-demos/package.py

@@ -54,7 +54,7 @@ class WfBrainscales2Demos(Package):
         try:
             # execute notebook and save
             jupyter(*args)
-        except Exception as e:
+        except ProcessError as e:
             # if the above fails, re-run notebook to produce output with error
             jupyter(*(args+["--allow-errors"]))
             raise

packages/wf-multi-area-model/package.py

@@ -47,7 +47,7 @@ class WfMultiAreaModel(Package):
         try:
             # execute notebook and save
             jupyter(*args)
-        except Exception as e:
+        except ProcessError as e:
             # if the above fails, re-run notebook to produce output with error
             jupyter(*(args+["--allow-errors"]))
             raise