Return an empty response when an empty inline query is passed.

[noplanman]

Prevent an error exception when an empty inline query is being handled.

[jacklul]

Wait, I think Telegram expects answerInlineQuery even to empty queries, I think with your solution user will see infinity loading icon with empty query!

[noplanman]

Aaah yes, you're right!
So we'll need to find a different solution. The problem is, that if the inline query is empty, I get the following error:
{"ok":false,"error_code":400,"description":"Bad Request: Message must be non-empty"}

[jacklul]

Maybe just
'input_message_content' => new InputTextMessageContent([ 'message_text' => 'you enter: ' . $query
or when query is empty don't show any results (results array should be empty)

[noplanman]

@jacklul Have modified it to return an empty result, much better, thanks!