Bug report #18751: SAGA raster calculator additional layer is not treated as optional - QGIS Application - QGIS Issue Tracking

Bug report #18751

SAGA raster calculator additional layer is not treated as optional

Added by matteo ghetta over 6 years ago. Updated over 6 years ago.

Status:	Closed
Priority:	Normal
Assignee:	-
Category:	Processing/SAGA
Affected QGIS version:	master	Regression?:	Yes
Operating System:	linux	Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:
Crashes QGIS or corrupts data:	No	Copied to github as #:	26638

Description

When performing a calculation on just one single raster layer the following error shows up:

Processing algorithm…
AlgorithmDialog
Input parameters:
{ 'FORMULA' : 'a * 10', 'GRIDS' : '/tmp/processing_0d84d0cba3f64eca9243f2ba5fdb600f/aa9dc0ddfbda469795eebb092d750248/slope.tif', 'RESAMPLING' : 3, 'RESULT' : '/tmp/processing_0d84d0cba3f64eca9243f2ba5fdb600f/4a80bd4893b2470b81b8cf4a6ccfe81b/RESULT.sdat', 'TYPE' : 7, 'USE_NODATA' : False, 'XGRIDS' : '' }

Traceback (most recent call last):
File "/home/matteo/lavori/QGIS/newbuild/output/python/plugins/processing/algs/saga/SagaAlgorithm.py", line 258, in processAlgorithm
command += ' -{} "{}"'.format(param.name(), ';'.join(self.exportedLayers[param.name()]))
KeyError: 'XGRIDS'

Execution failed after 0.05 seconds

Loading resulting layers
Algorithm 'Raster calculator' finished

so it seems that the additional layer box has to be filled up with some layers.

In fact, when adding a layer, even if not used in the formula, the calculation works nice.