Fixed bug where cards without dueDate were not copied.

client/src/components/Card/ActionsStep.jsx

@@ -64,6 +64,12 @@ const ActionsStep = React.memo(
     if (card.dueDate !== null) {
       defaultPath.dueDate = card.dueDate;
     }
+    if (card.dueDate === null || card.dueDate === undefined) {
+      // eslint-disable-next-line no-param-reassign
+      if (defaultPath.dueDate) {
+        delete defaultPath.dueDate;
+      }
+    }
     defaultPath.stopwatch = card.stopwatch;
     defaultPath.labels = card.labels;
     defaultPath.boardMemberships = boardMemberships;

client/src/components/CardCopyStep/CardCopyStep.jsx

@@ -25,6 +25,11 @@ const CardCopyStep = React.memo(
       });
     }
 
+    if (defaultPath.dueDate === null || defaultPath.dueDate === undefined) {
+      // eslint-disable-next-line no-param-reassign
+      delete defaultPath.dueDate;
+    }
+
     const [path, handleFieldChange] = useForm(() => ({
       projectId: null,
       boardId: null,
@@ -35,7 +40,6 @@ const CardCopyStep = React.memo(
       attachments: defaultPath.attachments,
       labels: defaultPath.labels,
       users: defaultPath.users,
-      // dueDate: defaultPath.dueDate,
       ...defaultPath,
     }));