Bugfix: removed error when filling small regions

lib/Slic3r/Fill.pm

@@ -122,7 +122,7 @@ sub make_fill {
                     flow_ratio   => $flow_ratio * ($params->{flow_ratio} || 1),
                 ), @paths,
             ],
-        );
+        ) if @paths;
         ###$layer->fills->[-1]->cleanup;
     }
 }

lib/Slic3r/Fill/PlanePath.pm

@@ -43,7 +43,7 @@ sub fill_surface {
     my $polyline = Slic3r::Polyline->cast([
         map [ map {$_*$distance_between_lines} $path->n_to_xy($_) ], @n,
     ]);
-    return [] if !@{$polyline->points};
+    return {} if !@{$polyline->points};
     
     $self->process_polyline($polyline, $bounding_box);