1 files changed, 5 insertions, 0 deletions
diff --git a/coverage/data.py b/coverage/data.py
index 7b9dd7e..c9e9a03 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -230,6 +230,11 @@ class CoverageData(object):
             summ[filename_fn(filename)] = len(lines)
         return summ
 
+    def __nonzero__(self):
+        return bool(self._lines) or bool(self._arcs)
+
+    __bool__ = __nonzero__
+
     def has_arcs(self):
         """Does this data have arcs?"""
         return bool(self._arcs)