v.kernel creates map with -q flag

[cmbarton]

Describe the bug

In v.kernel, the -q flag is supposed to "only calculate optimal radius and exit (no map is written)." However, v.kernel will not run unless the overwrite flag is also invoked.

For example, the command:

v.kernel -q input=bridges@PERMANENT output=bridge_density50k radius=50000 multiplier=10000 generates this output:

ERROR: option <output>: <bridge_density50k> exists. To overwrite, use the --overwrite flag

If you then add the overwrite flag, a new map is written.

This should not happen.

System description (please complete the following information):

• Operating System: MacOS 13.5.1
• GRASS GIS version 8.4dev build 19-09-2023