Fix unreachable code coverage

src/language/node_processor/BuiltinFunctionProcessor.hpp

@@ -64,7 +64,9 @@ class BuiltinFunctionProcessor : public INodeProcessor
     }
 
     if (SignalManager::pauseOnError()) {
+      // LCOV_EXCL_START
       return m_function_expression_processor->execute(context_exec_policy);
+      // LCOV_EXCL_STOP
     } else {
       try {
         return m_function_expression_processor->execute(context_exec_policy);