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-rw-r--r--coverage/html.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/coverage/html.py b/coverage/html.py
index 3fcecc5d..b10bab24 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -237,7 +237,7 @@ class HtmlReporter:
self.pyfile_html_source = read_data("pyfile.html")
self.source_tmpl = Templite(self.pyfile_html_source, self.template_globals)
- def report(self, morfs: Iterable[TMorf]) -> float:
+ def report(self, morfs: Optional[Iterable[TMorf]]) -> float:
"""Generate an HTML report for `morfs`.
`morfs` is a list of modules or file names.