Enhance FalukantService and UI components for improved product handling

- Updated FalukantService to allow optional inclusion of productType in queries, enhancing flexibility in data retrieval.
- Modified SaleSection.vue to conditionally display product information and size, improving user experience by handling cases with no product.
- Added new German translation for 'runningNoProduct' to enhance localization support for users.

frontend/src/components/falukant/SaleSection.vue

@@ -146,8 +146,18 @@
                   ? $t('falukant.branch.sale.runningDirectionOut')
                   : $t('falukant.branch.sale.runningDirectionIn') }}
               </td>
-              <td>{{ $t(`falukant.product.${t.product.labelTr}`) }}</td>
-              <td>{{ t.size }}</td>
+              <td>
+                <span v-if="t.product && t.product.labelTr">
+                  {{ $t(`falukant.product.${t.product.labelTr}`) }}
+                </span>
+                <span v-else class="no-product">
+                  {{ $t('falukant.branch.sale.runningNoProduct') }}
+                </span>
+              </td>
+              <td>
+                <span v-if="t.product && t.size > 0">{{ t.size }}</span>
+                <span v-else>—</span>
+              </td>
               <td>{{ t.sourceRegion?.name }}</td>
               <td>{{ t.targetRegion?.name }}</td>
               <td>{{ formatEta(t) }}</td>