Return null if deserializing an export timespan doesn't succeed with at least one...

This should fix an issue with loading old sessions using the old way of
handling session ranges specially.

diff --git a/libs/ardour/export_profile_manager.cc b/libs/ardour/export_profile_manager.cc
index bc4b31e3244501ba8fc233faac52d017ccefe59a..42e494c0cb3c9e1d56f289085149c3d7cae0f678 100644 (file)
--- a/libs/ardour/export_profile_manager.cc
+++ b/libs/ardour/export_profile_manager.cc
@@ -437,6 +437,10 @@ ExportProfileManager::deserialize_timespan (XMLNode & root)
                state->time_format = (TimeFormat) string_2_enum (prop->value(), TimeFormat);
        }
 
+       if (state->timespans->empty()) {
+               return TimespanStatePtr();
+       }
+
        return state;
 }