Exclude unreachable line from coverage

src/language/node_processor/BinaryExpressionProcessor.hpp

@@ -201,7 +201,7 @@ class BinaryExpressionProcessor final : public INodeProcessor
     if constexpr (_is_defined) {
       return this->_eval(m_node.children[0]->execute(exec_policy), m_node.children[1]->execute(exec_policy));
     } else {
-      return {};
+      return {};   // LCOV_EXCL_LINE
     }
   }