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-rw-r--r--coverage/data.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/coverage/data.py b/coverage/data.py
index 68b0212..3eb51bf 100644
--- a/coverage/data.py
+++ b/coverage/data.py
@@ -301,7 +301,8 @@ class CoverageData(object):
else:
file_data['lines'] = self._lines
- file_data['plugins'] = self._plugins
+ if self._plugins:
+ file_data['plugins'] = self._plugins
# Write the data to the file.
json.dump(file_data, file_obj)