Artifact name defaults to scheme if PRODUCT_NAME is empty (#260)

* Artifact name defaults to scheme if PRODUCT_NAME is empty

* Regenerate README

Author: godrei

README.md

@@ -75,7 +75,7 @@ You can also run this step directly with [Bitrise CLI](https://github.com/bitris
 | `export_options_plist_content` | Specifies a plist file content that configures archive exporting.  If not specified, the Step will auto-generate it. |  |  |
 | `output_dir` |  | required | `$BITRISE_DEPLOY_DIR` |
 | `export_all_dsyms` |  | required | `yes` |
-| `artifact_name` | This name will be used as basename for the generated Xcode Archive, App, IPA and dSYM files.  If not specified, the Product Name (`PRODUCT_NAME`) Build settings value will be used. |  |  |
+| `artifact_name` | This name will be used as basename for the generated Xcode Archive, App, IPA and dSYM files.  If not specified, the Product Name (`PRODUCT_NAME`) Build settings value will be used. If Product Name is not specified, the Scheme will be used. |  |  |
 | `cache_level` | Defines what cache content should be automatically collected.  Available options:  - `none`: Disable collecting cache content - `swift_packages`: Collect Swift PM packages added to the Xcode project | required | `swift_packages` |
 | `verbose_log` |  | required | `no` |
 </details>

main.go

@@ -288,7 +288,7 @@ func (s XcodeArchiveStep) ProcessInputs() (Config, error) {
 			return Config{}, fmt.Errorf("failed to read build settings: %w", err)
 		}
 		productName, err := settings.String("PRODUCT_NAME")
-		if err != nil {
+		if err != nil || productName == "" {
 			logger.Warnf("Product name not found in build settings, using scheme (%s) as artifact name", config.Scheme)
 			productName = config.Scheme
 		}

step.yml

@@ -240,6 +240,7 @@ inputs:
       This name will be used as basename for the generated Xcode Archive, App, IPA and dSYM files.
 
       If not specified, the Product Name (`PRODUCT_NAME`) Build settings value will be used.
+      If Product Name is not specified, the Scheme will be used.
 
 # Caching