chore(releaser/github): will not exex upload of assets when no gitreleaser gets inizialized from CreateRelease()

internal/releaser/github/github.go

@@ -114,6 +114,7 @@ func (g *Client) CreateRelease(releaseVersion *shared.ReleaseVersion, generatedC
 
 // UploadAssets uploads specified assets
 func (g *Client) UploadAssets(repoDir string, assets []config.Asset) error {
+	if g.release != nil {
 		filesToUpload, err := util.PrepareAssets(repoDir, assets)
 		if err != nil {
 			return err
@@ -135,5 +136,6 @@ func (g *Client) UploadAssets(repoDir string, assets []config.Asset) error {
 				return fmt.Errorf("releaser: github: Could not upload asset %s: %s", file.Name(), resp.Status)
 			}
 		}
+	}
 	return nil
 }