Fix error on startup when no plugin loaded

src/sakia/data/files/plugins.py

@@ -57,6 +57,7 @@ class PluginsDirectory:
                                               plugin_module,
                                               with_plugin)
                 except ImportError as e:
+                    self.with_plugin = Plugin(module_name, "", "", False, None, with_plugin)
                     self._logger.debug(str(e) + " with sys.path " + str(sys.path))
         except OSError as e:
             self._logger.debug(str(e))

src/sakia/gui/main_window/model.py

@@ -11,6 +11,8 @@ class MainWindowModel(QObject):
         self.app = app
 
     def load_plugins(self, main_window):
-        for plugin in self.app.plugins_dir.plugins + [self.app.plugins_dir.with_plugin]:
+        for plugin in self.app.plugins_dir.plugins:
             if plugin.imported:
                 plugin.module.plugin_exec(self.app, main_window)
+        if self.app.plugins_dir.with_plugin:
+            self.app.plugins_dir.with_plugin.module.plugin_exec(self.app, main_window)