Making an assert a bit more helpful

diff --git a/src/gonvert_qt.py b/src/gonvert_qt.py
index 58ddf58..561c737 100755 (executable)
--- a/src/gonvert_qt.py
+++ b/src/gonvert_qt.py
@@ -831,7 +831,7 @@ class QuickConvert(object):
                        for item in self._outputView.selectedItems()
                ]
                if selectedNames:
-                       assert len(selectedNames) == 1
+                       assert len(selectedNames) == 1, selectedNames
                        name = selectedNames[0]
                        self._select_output(name)
                else: