refactor: remove redundant len check (#2291)

`len` returns 0 if the slice or map is nil. From the Go specification
[1]:

  "1. For a nil slice, the number of iterations is 0."
  "3. If the map is nil, the number of iterations is 0."

Therefore, an additional `len(v) != 0` check for before the loop is
unnecessary.

[1]: https://go.dev/ref/spec#For_range

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

get.go

@@ -26,11 +26,9 @@ func printPkgbuilds(dbExecutor download.DBSearcher, aurClient aur.QueryClient,
 		logger.Errorln(err)
 	}
 
-	if len(pkgbuilds) != 0 {
 	for target, pkgbuild := range pkgbuilds {
 		logger.Printf("\n\n# %s\n\n%s", target, string(pkgbuild))
 	}
-	}
 
 	if len(pkgbuilds) != len(targets) {
 		missing := []string{}

query.go

@@ -80,11 +80,9 @@ func syncInfo(ctx context.Context, run *runtime.Runtime,
 		missing = true
 	}
 
-	if len(info) != 0 {
 	for i := range info {
 		printInfo(run.Logger, run.Cfg, &info[i], cmdArgs.ExistsDouble("i"))
 	}
-	}
 
 	if missing {
 		err = fmt.Errorf("")