FIX: fix the crash issue when network plugin installing on mac

Change-Id: I766d186fa116986ce4805e71dc5f1899f5901294

src/slic3r/GUI/WebGuideDialog.hpp

@@ -41,7 +41,7 @@ public:
     virtual ~GuideFrame();
 
     enum GuidePage {
-        BBL_WELCOME, 
+        BBL_WELCOME,
         BBL_REGION,
         BBL_MODELS,
         BBL_FILAMENTS,
@@ -93,7 +93,7 @@ public:
     int ShowPluginStatus(int status, int percent, bool &cancel);
 
     void on_dpi_changed(const wxRect &suggested_rect) {}
-    
+
 private:
     GUI_App *m_MainPtr;
     AppConfig m_appconfig_new;
@@ -112,6 +112,7 @@ private:
     std::string m_Region;
 
     bool InstallNetplugin;
+    bool network_plugin_ready {false};
 
 #if wxUSE_WEBVIEW_IE
     wxMenuItem *m_script_object_el;