Fix single technology image

It caused premature ending of the status processing in the admin.

docker/types.go

@@ -321,6 +321,11 @@ func (c *Container) GetTechs() (apps.AppTechs, error) {
 		return techs, nil
 	}
 
+	// If the directory doesn't exist it's single technology image
+	if strings.Contains(string(*stdouterr), "No such file or directory") {
+		return techs, nil
+	}
+
 	techsRaw := strings.Fields(string(*stdouterr))
 	for _, techRaw := range techsRaw {
 		techParts := strings.Split(techRaw, "-")