Fixes #2912: Relative view files will be looked for under the directory containing the view currently being rendered

issue #2852

Control statements based on the if and elseif constructs must have a single space before the opening parenthesis of the conditional and a single space after the closing parenthesis.

To prevent Warning "Trying to get property of non-object" in case when nothing set to params, but you try to get some key (check is there something)

ArrayHelper::getValue($this->view->params, 'abc');

adjust depended asset position or throw exception on conflict