[FIX] web: error image when no kanban image

Introduce back part of `formatBinary` that was reverted with 7813a8e7.

When an image is unset, the value was `false` which would end up with a
bin_size of `NaN Bytes` which would end up displaying an error image
with source `data:image/png;base64,NaN Bytes`.

This commit get back a previous behavior so the bin_size when the
attachment does not exist is an empty string (so: '').

opw-805542
closes #22348

1 files changed, 4 insertions, 1 deletions

diff --git a/addons/web/static/src/js/fields/field_utils.js b/addons/web/static/src/js/fields/field_utils.js
index 5ac180b1de1..5a11f1b0ba8 100644
--- a/addons/web/static/src/js/fields/field_utils.js
+++ b/addons/web/static/src/js/fields/field_utils.js
@@ -30,7 +30,7 @@ var _t = core._t;
 /**
  * Convert binary to bin_size
  * 
- * @param {string} value base64 representation of the binary (might be already a bin_size!)
+ * @param {string} [value] base64 representation of the binary (might be already a bin_size!)
  * @param {Object} [field]
  *        a description of the field (note: this parameter is ignored) 
  * @param {Object} [options] additional options (note: this parameter is ignored)
@@ -38,6 +38,9 @@ var _t = core._t;
  * @returns {string} bin_size (which is human-readable)
  */
 function formatBinary(value, field, options) {
+    if (!value) {
+        return '';
+    }
     return utils.binaryToBinsize(value);
 }