TestComplete - check whether the property value is empty

Script or keyword test?

In script, if you want to check the property value and return a true or false, then I'd do something like this (JavaScript)

var myObject = Aliases.MyApp.buttonLogout;
if (aqObject.CompareProperty(myObject.contentText, 0, '', false, 0){
    Log.Message('content text is blank, checking idStr');
    aqObject.CompareProperty(myObject.idStr, 0, '', false, 2)
}

The CompareProperty method of aqObject will check the property of an object based upon the condition and value passed.  If the condition passes, the method returns true, if not, it returns false.  You can have the method log a message or not and that message could be a warning or an error as desired.  See https://support.smartbear.com/testcomplete/docs/reference/program-objects/aqobject/compareproperty.html

Now, you can simplify it by just using simple if/then logic...

var myObject = Aliases.MyApp.buttonLogout;
if (myObject.contentText === ''){
    Log.Message('no content text, checking idStr');
    if (myObject.idStr === '' {
         Log.Warning('idStr is blank');
    }
}

Either way will work.