fix sizeof warning, which triggered SyntaxError: Unexpected token error

[granny]

Closes #28 Not sure if there were any other warnings/errors that could've been the cause. This was what made it work for me. Found the issue by logging the xhr output from the xhrError function in main.js, with the output in responseText having:

<b>Warning</b>:  sizeof(): Parameter must be an array or an object that implements Countable in <b>/www/public/lookup.php</b> on line <b>158</b><br />
<b>Warning</b>:  sizeof(): Parameter must be an array or an object that implements Countable in <b>/www/public/lookup.php</b> on line <b>160</b><br />
<b>Warning</b>:  sizeof(): Parameter must be an array or an object that implements Countable in <b>/www/public/lookup.php</b> on line <b>161</b><br />

Would definitely recommend better logging for end-users, or at-least an error in the console showing the responseText in case something similar happens again.

[chuushi]

Hi @granny, thank you for the PR! I'm sorry I noticed it only today ;w;