Wikimedia Bugzilla is closed!

Currently a jqplotbar diagram will not be shown unless you define an explicit value for distributionlimit, which shouldn't be the case.

Some investigation reveals that the problem is in SMWAggregatablePrinter::applyDistributionParams(), in the following code block:

if ( $this->params['distributionlimit'] !== false ) {
	$data = array_slice( $data, 0, $this->params['distributionlimit'], true );
}

The default value for distributionlimit is 0, which will trigger the if-condition and cause data to be sliced into nothing.

A quick fix will be to either change the comparison operator to != (i.e. allow type juggeling) or compare to 0 instead of false.