Fix widget _getValue pb with callable

Author: jcheron

Ajax/semantic/widgets/base/InstanceViewer.php

@@ -121,17 +121,18 @@ protected function _getValue($property, $index) {
 		if ($property instanceof \ReflectionProperty) {
 			$value = $this->_getPropertyValue($property);
 			$propertyName = $property->getName();
-		} elseif (\is_callable($property) && array_search($property, [
-			"system"
-		]) === false)
-			$value = $property($this->instance);
+		} elseif (\is_callable($property) && \array_search($property, ['system','date']) === false){
+			try{
+				$value = $property($this->instance);
+			}catch(\Error $e){}
+		}
 		elseif (\is_array($property)) {
 			$values = \array_map(function ($v) use ($index) {
 				return $this->_getValue($v, $index);
 			}, $property);
-			$value = \implode("", $values);
+			$value = \implode('', $values);
 		} elseif (\is_string($property)) {
-			$value = "";
+			$value = '';
 			if (isset($this->instance->{$property})) {
 				$value = $this->instance->{$property};
 			} elseif (\method_exists($this->instance, $getter = JReflection::getterName($property))) {