Now always showing the decrypt button when errors occured.

src/mainwindow.c

@@ -747,6 +747,7 @@ void mainWindow_switch_workspace(struct mainWindow *mainWindow, gchar *path, gbo
 					       mdiary_scanner->entries_failed,
 					       mdiary_scanner->entries_failed > 1 ? "ies" : "y");
 			mainWindow_show_error(mainWindow, temp);
+			gtk_widget_set_visible(mainWindow->buttonDecrypt, TRUE);
 			g_free(temp);
 		}
 	} else {