protect query-parameters against exceptions with empty values
The page_conract filter require a "notnull", otherwise it lets values like ..…
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protect query-parameters against exceptions with empty valuesThe page_conract filter require a "notnull", otherwise it letsvalues like ...?v=&... through, although {v:boolean} was used.These empty values will cause exceptions, when it is laterassumed that "v" has a proper boolean value.
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