Harlequin does not run previous query when current query is only whitespace

[tconbeer]

          I just run into this with an even more confusing behavior:

As some prompts require the SQL statements to be terminated with a semi-colon, I had added one to the end of the query. When the semi-colon is the last character of the prompt, trying to run the prompt works fine. But if it's not the last character, e.g. another new line or space after the semi-colon, then just nothing happens when trying to run the query.

This behavior is extremely confusing, as there is no error message or anything hinting on the issue. It just feels weirdly broken. I guess the queries should be just trimmed automatically before execution.

Originally posted by @ml31415 in #348 (comment)