Protect MPI-dependent closing brace with MPI pre-compiler directive

src/cluster/cluster.cpp

@@ -482,7 +482,7 @@ void cluster(const string& config_file, const string& data_file, const string& o
 #endif
 #pragma omp barrier
 
-	} // close strided loop running on MPI processes
+	} // close strided loop running on MPI processes, ixi488 loop
 	// delete the shared arrays I used to make available to thread 0 the virtual files of other threads
 #pragma omp barrier
 	if (myompthread == 0) {
@@ -633,7 +633,9 @@ void cluster(const string& config_file, const string& data_file, const string& o
     fclose(timing_file);
     delete time_logger;
     delete logger;
+#ifdef MPI_VERSION
   }
+#endif
 }
 
 int cluster_jxi488_cycle(int jxi488, ScattererConfiguration *sconf, GeometryConfiguration *gconf, ScatteringAngles *sa, ClusterIterationData *cid, VirtualAsciiFile *output, const string& output_path, VirtualBinaryFile *vtppoanp)