fix crash when using track templates caused by a recent change to the filescanner API. if the template contains no plugin states, the scanner would return a null pointer, and we would fail to notice

1 files changed, 10 insertions, 4 deletions

diff --git a/libs/pbd/file_utils.cc b/libs/pbd/file_utils.cc
index 7c3dffe71f..bb290fa6aa 100644
--- a/libs/pbd/file_utils.cc
+++ b/libs/pbd/file_utils.cc
@@ -18,6 +18,7 @@
 */
 
 #include <algorithm>
+#include <vector>
 
 #include <glib.h>
 #include <glib/gstdio.h>
@@ -32,6 +33,7 @@
 #include "pbd/file_utils.h"
 #include "pbd/error.h"
 #include "pbd/pathscanner.h"
+#include "pbd/stl_delete.h"
 
 #include "i18n.h"
 
@@ -165,10 +167,14 @@ copy_files(const std::string & from_path, const std::string & to_dir)
 {
 	PathScanner scanner;
 	vector<string*>* files = scanner (from_path, accept_all_files, 0, true, false);
-	for (vector<string*>::iterator i = files->begin(); i != files->end(); ++i) {
-		std::string from = Glib::build_filename (from_path, **i);
-		std::string to = Glib::build_filename (to_dir, **i);
-		copy_file (from, to);
+
+	if (files) {
+		for (vector<string*>::iterator i = files->begin(); i != files->end(); ++i) {
+			std::string from = Glib::build_filename (from_path, **i);
+			std::string to = Glib::build_filename (to_dir, **i);
+			copy_file (from, to);
+		}
+		vector_delete (files);
 	}
 }