fixed a crash when clicking on the run button and no file is opened

git-svn-id: https://geany.svn.sourceforge.net/svnroot/geany/trunk@345 ea778897-0a13-0410-b9d1-a72fbfd435f5

src/document.c

@@ -347,6 +347,7 @@ gboolean document_remove(guint page_num)
 			utils_set_window_title(-1);
 			utils_save_buttons_toggle(FALSE);
 			utils_close_buttons_toggle();
+			utils_build_show_hide(-1);
 		}
 	}
 	else geany_debug("Error: idx: %d page_num: %d", idx, page_num);

src/utils.c

@@ -1249,9 +1249,19 @@ void utils_build_show_hide(gint idx)
 #ifndef GEANY_WIN32
 	gboolean is_header = FALSE;
 	gchar *ext = NULL;
-	filetype *ft = doc_list[idx].file_type;
+	filetype *ft;
 
-	if (idx >= 0 && doc_list[idx].file_name)
+	if (idx == -1)
+	{
+		gtk_widget_set_sensitive(lookup_widget(app->window, "menu_build1"), FALSE);
+		gtk_widget_set_sensitive(app->compile_button, FALSE);
+		gtk_widget_set_sensitive(app->run_button, FALSE);
+		return;
+	}
+
+	ft = doc_list[idx].file_type;
+
+	if (doc_list[idx].file_name)
 	{
 		ext = strrchr(doc_list[idx].file_name, '.');
 	}