BISERVER-11225 - in PUC browser if user doesn't have ACL permissions for folder/file and clicks on properties, javascript error occurs.

check if permissionsTab is not null;
don't send request if there is nothing to send
Merge pull request #1438 from aliakseihaidukou/BISERVER-11225

BISERVER-11225 - in PUC browser if user doesn't have ACL permissions for...