[QGIS-Developer] QgsProcessingAlgorithm: no output layer when cancelled

[Nils Nolde]

Hola,

running into 2 notorious problems with the ORS Tools plugin:

1. QgsProcessingAlgorithm, where it doesn't return the features which 
were processed until the user presses Cancel. More elaborate on SE:

https://gis.stackexchange.com/questions/328913/pyqgis-qgsprocessingalgorithm-no-output-layer-when-cancelled

2. Another, more subtle, behavior when someone uses the batch processing 
algorithms for ORS Tools plugin like so:

- save result as .shp or .gpkg instead of memory layer

- user exceeds our minutely query limit (usually 40 queries/minute), 
i.e. errors are printed, but internally NetworkAccessManager is just 
sleeping until the minute is over and the limit is lifted

- when all is done, the resulting layer is empty. However, when using 
memory layers instead, the results are available.

Thanks for any insight, running out of coffee soon..

Cheers
Nils