Fixes #936 - Fix setacl command exception #959
Merged
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Grantee.display_name may not be initialize for some Grantee types,
most notably for xsi:type="Group".
However, tolower() is called on this attribute in ACL.revoke(),
raising unhandled AttributeError. To prevent it, let's change
default value of Grantee.display_name to empty string with almost
identical semantical value, but allowing lower() call to succeed.
I also applied the Boolean Distributive law to simplify condition
in ACL.revoke().