I think it's a good idea to folow the kdelibs coding guidelines closely. You are not kdelibs however, so you can define your own rules.

In this case you can either use braces or unindent the second line after the if statement.

In case you are interested in using braces everywhere (after sorting out the misleading indentation), you can use

clang-tidy -checks="readability-braces-around-statements" *.cpp -fix

to do it for you. It's not always beautiful but it spares you the searching. :)

I also use clang-format to enforce the style I chose.
https://github.com/fschwarzer/clang-format-file
I think it's not completely kdelibs-compliant, but it comes close. If you find something in there that can be made more kdelibs style, please consider creating a pull request to my repo so I can get the fix as well. :)

I am now closing this Diff, since I committed the change yesterday.