When the clipboard fails to retrieve text

[Davider]

I'd like to know how to continue execution when unable to retrieve text from the clipboard. In QM, I can simply use 'err' or omitted. How do I handle this in LA?
(This is an assumption: The text is empty when using the hotkey Ctrl+a)
OR, Is there a member function similar to getsel in QM for LA?

LA: 
 

Code:

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keys.send("Ctrl+A");
string s = clipboard.copy(); //get the selected text
//handle err ???
print.it(s);

QM:

Code:

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'Ca
str s.getsel
err
out s