Merge pull request #2113 from Inist-CNRS/2109-la-routine-cross-by-et-…

…sans-doute-dautres-ne-prend-pas-en-compte-0-comme-valeur

fix: exclude only undefined values

packages/ezsLodex/src/formatOutput.js

@@ -47,7 +47,7 @@ function formatOutput(data, feed) {
         if (keys.length > 0) {
             let check = false;
             keys.forEach((k, index) => {
-                if (values[index]) {
+                if (values[index] !== undefined) {
                     feed.write(!check ? ' ' : ',');
                     check = true;
                     feed.write(json(k));