[wptserve] Fix an exception handler in stash
internal_key is a tuple whose items are guaranteed to be strings.
It should be used as the key directly.
diff --git a/tools/wptserve/wptserve/stash.py b/tools/wptserve/wptserve/stash.py
index 8b6fd34..541aced 100644
--- a/tools/wptserve/wptserve/stash.py
+++ b/tools/wptserve/wptserve/stash.py
@@ -162,7 +162,7 @@
if internal_key in self.data:
raise StashError("Tried to overwrite existing shared stash value "
"for key %s (old value was %s, new value is %s)" %
- (internal_key, self.data[str(internal_key)], value))
+ (internal_key, self.data[internal_key], value))
else:
self.data[internal_key] = value