plugin_installer. coding style

plugin_installer/plugin_installer.py

@@ -285,8 +285,8 @@ class PluginInstaller(GajimPlugin):
             if is_active and plugin.name != self.name:
                 gobject.idle_add(gajim.plugin_manager.activate_plugin, plugin)
             if plugin.name != 'Plugin Installer':
-                version = gajim.version.split('-')[0]
-                if version == '0.15':
+                if gajim.version.split('-')[0] == '0.15':
+                    # plugin do not have 'activatable' propetry in the Gajim 0.15
                     self.installed_plugins_model.append([plugin, plugin.name,
                         is_active])
                 else: