Warning for too long "Search database" request

Done in Database search: process can now be run without inputs · brainstorm-tools/brainstorm3@53cc6b2 · GitHub, thanks for the reminder. I tried to optimize it when you specify a file type in your search query (highly recommended on big datasets).

Do you mind helping me test this @pantazis?
@Francois Can you validate how I check for bad trials? I tried to mirror what was done in the other Select Files process, but they did not have statistic files.

Thanks!
Martin