Fix copacetic error handling when no vulnerabilities found

Author: paulmorar

pkg/copa/main.go

@@ -70,7 +70,7 @@ func (o PatchOption) Run(ctx context.Context, reportFilePaths map[*registry.Imag
 			CertPath:   o.Buildkit.CertPath,
 			KeyPath:    o.Buildkit.KeyPath,
 		}, outFilePaths[i]); err != nil {
-			return fmt.Errorf("error patching image %s :: %w ", ref, err)
+			return fmt.Errorf("error patching image %s :: %w", ref, err)
 		}
 
 		_ = bar.Add(1)

pkg/copa/patch.go

@@ -58,7 +58,7 @@ func Patch(ctx context.Context, timeout time.Duration, image, reportFile, patche
 
 	select {
 	case err := <-ch:
-		if err == nil {
+		if err == nil || err.String() == "no patchable vulnerabilities found" {
 			return nil
 		}
 		return fmt.Errorf("copa: error patching image :: %w", err)