v.external: define error handler for output map

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@50762 15284696-431f-4ddb-bdfa-cd5b030d7da7

vector/v.external/main.c

@@ -98,6 +98,8 @@ int main(int argc, char *argv[])
     }
     
     Vect_open_new(&Map, output, is3D);
+    Vect_set_error_handler_io(NULL, &Map);
+    
     Vect_hist_command(&Map);
     Vect_close(&Map);