Fix for potential empty value in status email value

• Up to SDK 1.0.1

• Fix for potential empty value in status email value

src/main/java/org/eclipsefoundation/git/eca/config/EclipseQuteTemplateExtensions.java

@@ -61,6 +61,7 @@ public class EclipseQuteTemplateExtensions {
                 .filter(s -> s.getErrors().isEmpty())
                 .map(CommitValidationStatus::getUserMail)
                 .distinct()
+                .filter(StringUtils::isNotBlank)
                 .toList();
     }