fix: Make irma scheme verify fail when specific folder isn't a scheme, and...

fix: Make irma scheme verify fail when specific folder isn't a scheme, and also doesn't contain any subfolders.

irma/cmd/verify.go

@@ -9,6 +9,7 @@ import (
 	"github.com/privacybydesign/irmago"
 	"github.com/privacybydesign/irmago/internal/fs"
 	"github.com/spf13/cobra"
+	"github.com/go-errors/errors"
 )
 
 // verifyCmd represents the verify command
@@ -85,6 +86,9 @@ func VerifyIrmaConfiguration(path string) error {
 	if err := conf.CheckKeys(); err != nil {
 		return err
 	}
+	if len(conf.SchemeManagers) == 0 {
+		return errors.New("Specified folder doesn't contain any schemes")
+	}
 
 	for _, manager := range conf.SchemeManagers {
 		if err := conf.VerifySchemeManager(manager); err != nil {