coding style: don't format an empty string with another string

'{}'.format('foo') for any given value of 'foo' (in this case, a
function returning a string), can always just be 'foo' directly, which
is a lot more readable.

mesonbuild/dependencies/detect.py

@@ -143,7 +143,7 @@ def find_external_dependency(name: str, env: 'Environment', kwargs: T.Dict[str,
     # otherwise, the dependency could not be found
     tried_methods = [d.log_tried() for d in pkgdep if d.log_tried()]
     if tried_methods:
-        tried = '{}'.format(mlog.format_list(tried_methods))
+        tried = mlog.format_list(tried_methods)
     else:
         tried = ''