Minor changes

assets/js/media-admin.js

@@ -103,10 +103,20 @@
                 }
             });
 
-            var payload = await response.json();
+            var contentType = response.headers.get('content-type') || '';
+            var raw = await response.text();
+            var payload = {};
+
+            if (contentType.indexOf('application/json') !== -1) {
+                try {
+                    payload = JSON.parse(raw);
+                } catch (parseError) {
+                    payload = {};
+                }
+            }
 
             if (!response.ok) {
-                throw new Error(payload.error || 'Le téléversement a échoué.');
+                throw new Error(payload.error || ('HTTP ' + response.status + (raw ? ' - ' + raw.slice(0, 180) : '')));
             }
 
             setFeedback('Image téléversée. Rafraîchissement…', false);