support shortname only command #51

Author: neuecc

src/ConsoleAppFramework/CommandHelpBuilder.cs

@@ -294,7 +294,10 @@ public CommandHelpDefinition CreateCommandHelpDefinition(MethodInfo method)
                     else
                     {
                         // If Index is -1, ShortName is initialized at Constractor.
-                        options.Add($"-{option.ShortName!.Trim('-')}");
+                        if (option.ShortName != null)
+                        {
+                            options.Add($"-{option.ShortName.Trim('-')}");
+                        }
                     }
                 }
 

src/ConsoleAppFramework/OptionAttribute.cs

@@ -28,7 +28,7 @@ public OptionAttribute(string shortName)
             this.Description = null;
         }
 
-        public OptionAttribute(string shortName, string description)
+        public OptionAttribute(string? shortName, string description)
         {
             this.Index = -1;
             this.ShortName = shortName;