# alphabetic style label for entries without author

I would like to use the Biblatex alphabetic citation style, which produces citation labels like [Knu]. However, two of my references are websites, and they have no author. Currently they are displayed as []. Is there a way to put a specific string as the label in this case? I have tried setting the labelalpha key manually, but that doesn't work.

MWE: file mwe.tex

\documentclass{article}
\usepackage[backend=biber,style=alphabetic]{biblatex}
\begin{document}
Go check~\cite{texse}!
\printbibliography
\end{document}


file mwe.bib

@online{texse,
url={http://tex.stackexchange.com},
title={Awesome website},
labelalpha={TexSE},
}


Current output:

Desired output: [TexSE] instead of [].

Use the label field:
@online{texse,