2 files changed, 20 insertions, 2 deletions
diff --git a/coverage/debug.py b/coverage/debug.py
index 3a6b1fdc..c11c927a 100644
--- a/coverage/debug.py
+++ b/coverage/debug.py
@@ -8,6 +8,7 @@ import functools
 import inspect
 import itertools
 import os
+import pprint
 import sys
 try:
     import _thread
@@ -193,6 +194,23 @@ class SimpleReprMixin(object):
             )
 
 
+def simplify(v):
+    """Turn things which are nearly dict/list/etc into dict/list/etc."""
+    if isinstance(v, dict):
+        return {k:simplify(vv) for k, vv in v.items()}
+    elif isinstance(v, (list, tuple)):
+        return type(v)(simplify(vv) for vv in v)
+    elif hasattr(v, "__dict__"):
+        return simplify({'.'+k: v for k, v in v.__dict__.items()})
+    else:
+        return v
+
+
+def pp(v):
+    """Debug helper to pretty-print data, including SimpleNamespace objects."""
+    pprint.pprint(simplify(v))
+
+
 def filter_text(text, filters):
     """Run `text` through a series of filters.
 
diff --git a/coverage/html.py b/coverage/html.py
index 78c982a2..cff2419d 100644
--- a/coverage/html.py
+++ b/coverage/html.py
@@ -116,8 +116,8 @@ class HtmlDataGeneration(object):
             elif lineno in analysis.statements:
                 category = 'run'
 
-            if self.config.show_contexts:
-                contexts = sorted(filter(None, contexts_by_lineno[lineno]))
+            if category and self.config.show_contexts:
+                contexts = sorted(c or "(empty)" for c in contexts_by_lineno[lineno])
             else:
                 contexts = None