When passing in empty parameter, indicate problem parameter in error message.
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Key: TAPESTRY-1978
URL: https://issues.apache.org/jira/browse/TAPESTRY-1978
Project: Tapestry
Issue Type: Improvement
Components: Framework
Affects Versions: 5.0.7
Reporter: Kevin Menard
Priority: Minor
While prototyping a page recently, I decided to hold off on passing in
parameters until I had a good sense of what their names should be. So, I had
something similar to:
<t:textfield value=""/>
Clearly this is a broken construct and Tapestry generally recognized it. I was
greeted with the following error message:
"Parameter expression was null or contained only whitespace."
And a highlighted block of my template. Unfortunately, the highlighted block
is not where the problem was. Likewise, the error message really didn't
indicate what parameter was broken of what component. After a little bit of
guess-and-check, I caught the obvious error. It'd be nice if Tapestry handled
this for me though.
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