Adds error handling for when there are no buildings inside the grid

dvlp/grid_tile.sh

@@ -151,7 +151,7 @@ function grid_shape() {
 	    -tye $ymin $ymax \
 	    -outsize $ncells $ncells \
 	    -co COMPRESS=DEFLATE -co PREDICTOR=1 -co ZLEVEL=9 \
-	    $pointfile $tiffile
+	    $pointfile $tiffile || echo "No buildings found in the layer, moving on"
     fi
 }