Improve exception message about unknown validation macro
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Key: TAP5-1517
URL: https://issues.apache.org/jira/browse/TAP5-1517
Project: Tapestry 5
Issue Type: Improvement
Components: tapestry-core
Affects Versions: 5.2.5
Reporter: Igor Drobiazko
Using unknown validation macro result in an exception, as follows:
Unknown validator type 'foo'. Configured validators are email, max, maxlength,
min, minlength, none, regexp, required.
The message should list all the known validation macros as well.
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