Exception message when a context value is null or blank is confusing
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Key: TAPESTRY-2221
URL: https://issues.apache.org/jira/browse/TAPESTRY-2221
Project: Tapestry
Issue Type: Bug
Components: tapestry-core
Affects Versions: 5.0.10
Reporter: Howard M. Lewis Ship
Null or blank values are not allowed in the page activation context or event
context because they are rendered out as nothing, and the consecutive slashes
in the URL are ambiguously handled by servlet containers.
However, the exception is the generic "parameter may not be blank" message from
Defense.notBlank().
A more specific error is required, which will inform the user about what was
actually wrong.
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