Code perform a check on epSecureEncrypt === null but not on epSecureChNone.
epSecureChNone.UserIdentityTokens throws error, as value of epSecureChnNone can be null if no insecure channel exists.

Would recommend adding:

if( epSecureChNone=== null ) {
addSkipped( "An insecure channel providing no message security is not available." );
return( false );
}

The test fails with a TypeError, when really it should: be skipped or fail with a message pointing to the origin of the problem. TypeError messages are not really user friendly.

Thank you in advance.