Code Cleanup

- Print a message in bulk change when the user choose not to denotate a
  specific task (more consistent behaviour with other bulk changes).

src/commands/CmdDenotate.cpp

@@ -127,6 +127,11 @@ int CmdDenotate::execute (std::string& output)
         if (context.verbose ("project"))
           projectChanges[task->get ("project")] = onProjectChange (*task, false);
       }
+      else
+      {
+        std::cout << STRING_CMD_DENO_NO << "\n";
+        rc  = 1;
+      }
       if (context.verbose ("blank"))
         std::cout << "\n";
     }