fix: handle tags without images gracefully

cli/recipe/upgrade.go

@@ -115,20 +115,20 @@ You may invoke this command in "wizard" mode and be prompted for input:
 			}
 			logrus.Debugf("retrieved %s from remote registry for %s", regVersions, image)
 
-			if strings.Contains(image, "library") {
-				// ParseNormalizedNamed prepends 'library' to images like nginx:<tag>,
-				// postgres:<tag>, i.e. images which do not have a username in the
-				// first position of the string
-				image = strings.Split(image, "/")[1]
-			}
-			semverLikeTag := true
-			if !tagcmp.IsParsable(img.(reference.NamedTagged).Tag()) {
-				logrus.Debugf("%s not considered semver-like", img.(reference.NamedTagged).Tag())
-				semverLikeTag = false
+			image = recipePkg.StripTagMeta(image)
+
+			switch img.(type) {
+			case reference.NamedTagged:
+				if !tagcmp.IsParsable(img.(reference.NamedTagged).Tag()) {
+					logrus.Debugf("%s not considered semver-like", img.(reference.NamedTagged).Tag())
+				}
+			default:
+				logrus.Warnf("unable to read tag for image %s, is it missing? skipping upgrade for %s", image, service.Name)
+				continue
 			}
 
 			tag, err := tagcmp.Parse(img.(reference.NamedTagged).Tag())
-			if err != nil && semverLikeTag {
+			if err != nil {
 				logrus.Fatal(err)
 			}
 			logrus.Debugf("parsed %s for %s", tag, service.Name)
@@ -148,7 +148,7 @@ You may invoke this command in "wizard" mode and be prompted for input:
 
 			sort.Sort(tagcmp.ByTagDesc(compatible))
 
-			if len(compatible) == 0 && semverLikeTag {
+			if len(compatible) == 0 {
 				logrus.Info(fmt.Sprintf("no new versions available for %s, %s is the latest", image, tag))
 				continue // skip on to the next tag and don't update any compose files
 			}