[GRASS-windows] Setting a paramaetr file name for Raster output

[Brian Sanjeewa Rupasinghe]

Hi all,

When i use a parameter to assign the output map name of r.mapcalc in GRASS7
for windows, it gives an error message saying:

Command 'd.rast map=viewshed2 at PERMANENT' failed
Details: Unknown display driver <cairo>

routput is a parameter set by options (routput = options['routput'])
grass.mapcalc("routput = viewshed + 1", overwrite = True, quiet = True)


However, when i just assign a name for the map without a parameter  the
output writes in the current MAPSET.
Here, viewshed1 is the new map after r.mapcalc operation


grass.mapcalc("viewshed1 = viewshed + 1", overwrite = True, quiet = True)

What is the cause for this?
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