Fix a preview issue when the plate has some error after another plate sliced

Change-Id: I66a5824b0b62afb854fa2649b72942c4beeccaca

src/slic3r/GUI/Plater.cpp

@@ -8727,6 +8727,7 @@ void Plater::reslice()
     if (p->process_completed_with_error)
     {
         BOOST_LOG_TRIVIAL(warning) << __FUNCTION__ << boost::format(": process_completed_with_error, return directly");
+        reset_gcode_toolpaths();
         return;
     }