Hello, It looks like <tal:block tal:define="label preferences/label|label" tal:replace="structure label"/> result in a null value for variable label if preferences/label is not defined, even if label is defined.
The problem comes from the generated code which looks like ... if (($ctx->label = phptal_path($ctx->preferences, 'label', true)) !== null): ; elseif (($ctx->label = $ctx->label) !== null): ; endif ; ... This might not be a bug but the right side expression should be evaluated first before assignment. A quick workaround would be to do something like <tal:block tal:define="xlabel preferences/label|label;label xlabel;" tal:replace="structure label"/> which works, but looks pretty ugly especially if you have lots of variables to define in tal:define attribute. Regards, Ciprian Vieru
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