- Fixed CGNS writing

Author: rois1995

SU2_CFD/src/output/filewriter/CCGNSFileWriter.cpp

@@ -38,7 +38,7 @@ void CCGNSFileWriter::WriteData(string val_filename) {
 
   /*--- We append the pre-defined suffix (extension) to the filename (prefix) ---*/
   val_filename.append(fileExt);
-
+  
   /*--- Open the CGNS file for writing.  ---*/
   InitializeMeshFile(val_filename);
 
@@ -132,15 +132,16 @@ void CCGNSFileWriter::WriteField(int iField, const string& FieldName) {
   /*--- Coordinate vector is written in blocks, one for each process. ---*/
   cgsize_t nodeBegin = 1;
   auto nodeEnd = static_cast<cgsize_t>(nLocalPoints);
-
-  if (isCoord) {
-    int CoordinateNumber;
-    CallCGNS(cg_coord_partial_write(cgnsFileID, cgnsBase, cgnsZone, dataType, FieldName.c_str(), &nodeBegin, &nodeEnd,
-                                    sendBufferField.data(), &CoordinateNumber));
-  } else {
-    int fieldNumber;
-    CallCGNS(cg_field_partial_write(cgnsFileID, cgnsBase, cgnsZone, cgnsFields, dataType, FieldName.c_str(), &nodeBegin,
-                                    &nodeEnd, sendBufferField.data(), &fieldNumber));
+  if(nLocalPoints > 0){
+    if (isCoord) {
+      int CoordinateNumber;
+      CallCGNS(cg_coord_partial_write(cgnsFileID, cgnsBase, cgnsZone, dataType, FieldName.c_str(), &nodeBegin, &nodeEnd,
+                                      sendBufferField.data(), &CoordinateNumber));
+    } else {
+      int fieldNumber;
+      CallCGNS(cg_field_partial_write(cgnsFileID, cgnsBase, cgnsZone, cgnsFields, dataType, FieldName.c_str(), &nodeBegin,
+                                      &nodeEnd, sendBufferField.data(), &fieldNumber));
+    }
   }
 
   for (int i = 0; i < size; ++i) {