bin/yaml2lutaml in lutaml-uml-0.2.0 vs bin/yaml2lutaml in lutaml-uml-0.2.1

@@ -43,11 +43,11 @@
     source = relationship_block["source"]
     sync_puts("owner_type #{source['type']}", 4)
     if source["attribute"]
       source_attribute_name = source["attribute"].keys.first
       owner += "##{source_attribute_name}"
-      if source["attribute"][source_attribute_name]["cardinality"]
+      if source["attribute"][source_attribute_name] && source["attribute"][source_attribute_name]["cardinality"]
         cardinality = source["attribute"][source_attribute_name]["cardinality"]
         owner += " [#{cardinality['min']}..#{cardinality['max']}]"
       end
     end
   end
@@ -59,11 +59,11 @@
     type = target["type"] || "direct"
     sync_puts("member_type #{type}", 4)
     if target["attribute"]
       target_attribute_name = target["attribute"].keys.first
       member += "##{target_attribute_name}"
-      if target["attribute"][target_attribute_name]["cardinality"]
+      if target["attribute"][target_attribute_name] && target["attribute"][target_attribute_name]["cardinality"]
         cardinality = target["attribute"][target_attribute_name]["cardinality"]
         member += " [#{cardinality['min']}..#{cardinality['max']}]"
       end
     end
   else
@@ -81,12 +81,12 @@
   process_association(values["source"], values, encountered_relations)
 end
 
 view_yaml["imports"].keys.each do |entry|
   import = YAML.safe_load(File.read(File.join(models_path, "#{entry}.yml")))
-  import_name = import["name"]
+  import_name = import["name"] ||  File.basename(entry)
   # Class notation
-  sync_puts("#{import['modelType']} #{import['name']} {", 2)
+  sync_puts("#{import['modelType']} #{import_name} {", 2)
   import["values"]&.each_pair do |key, values|
     sync_puts("#{key}", 4)
   end
   import["attributes"]&.each_pair do |key, values|
     cardinality = if values["cardinality"]