Delayed renderers: NULL values and non-string values are not checked

Description

If there is a bug ina viewlet that is rendered as a delayed renderer (part of full page caching), you get hard to debug results. The system should only attempt to render string results from delayed viewlets.

Environment

None

Assignee

Unassigned

Reporter

Dominic Watson

Labels

None

Accepted

Yes

Fix versions

Priority

Medium
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