Handling of situations where all values for a variable are nans

Some summary IDS extraction was failing because some variables were filled with nans, they were completely masked and interpos was throwing an error since it was trying to interpolate empty arrays. When this happens, the variable is now filled with 1 and a warning is issued.

matlab/TCV_IMAS/tcv_get_ids_summary.m

@@ -250,13 +250,12 @@ for i=1:numel(global_quantities_fieldnames)
   if ~any(strcmp(global_quantities_fieldnames{i},special_fields))
     if ~isstruct(ids_summary.global_quantities.(global_quantities_fieldnames{i}).value) && ...
         ~isempty(global_quantities.(global_quantities_fieldnames{i}).data)
-      % setup mask to get rid of nans
-      mask = ~isnan(global_quantities.(global_quantities_fieldnames{i}).data);
-      % interpolate quantity on ids_summary.time
+      %Use interpos_nan to get rid of nans. Arrays will be empty if filled with nans
       ids_summary.global_quantities.(global_quantities_fieldnames{i}).value = ...
-        interpos(21,global_quantities.(global_quantities_fieldnames{i}).t(mask),...
-        global_quantities.(global_quantities_fieldnames{i}).data(mask), ...
+        interpos_nan(21,global_quantities.(global_quantities_fieldnames{i}).t,...
+        global_quantities.(global_quantities_fieldnames{i}).data, ...
           ids_summary.time);
+
       ids_summary.global_quantities.(global_quantities_fieldnames{i}).source = ['gdat request: ' global_quantities_desc.(global_quantities_fieldnames{i})];
     elseif ~isempty(global_quantities.(global_quantities_fieldnames{i}).data)
       special_fields{end+1} = global_quantities_fieldnames{i};