add interactive message

[MxJ24]

add interactive message escapically when the result set is empty

[tkopets]

Thank you for your pull request. I understand you want to make SQLTools more convenient in your day-to-day use, but in my subjective opinion, most parts of this code is not a good fit for SQLTools, which is intended to be a thin wrapper around RDBMS specific command line interface (CLI).

The problem with your code:

• most parts are MySQL specific but are executed for all RDBMS (PostgreSQL, Oracle, SQLite, MSSQL, Vertica).
• you are altering the output from CLI. Which is not what some users would expect. It is a much better idea to submit a pull request or feature request to your specific RDBMS community (in your case MySQL) if you don't like the output of CLI or want it to be more configurable to your needs. Also, imagine how SQLTools code would look like if everyone would like to tweak something in the output for each of those RDBMS's.
• your code silently ignores security warning, which is not the best idea. There might be better ways to supply password to MySQL CLI, including .my.cnf.
• parts of your code is duplicating the functionality of show_query setting.

[tkopets]

The idea of displaying the status message, when executing command is great!

[tkopets]

There are two alternative methods in v0.8.3 to supply a password for MySQL connections. As well as message in status bar to display when the query is executed.