Don't show empty table heading when no builds (#595)

Author: timja

src/main/frontend/multi-pipeline-graph-view/multi-pipeline-graph/main/MultiPipelineGraph.tsx

@@ -16,18 +16,22 @@ export const MultiPipelineGraph = () => {
     }
   }, [runs, poll]);
   return (
-    <table className="jenkins-table sortable">
-      <thead>
-        <tr>
-          <th className="jenkins-table__cell--tight">id</th>
-          <th data-sort-disable="true">pipeline</th>
-        </tr>
-      </thead>
-      <tbody>
-        {runs.map((run) => (
-          <SingleRun key={run.id} run={run} />
-        ))}
-      </tbody>
-    </table>
+    <>
+      {runs.length > 0 && (
+        <table className="jenkins-table sortable">
+          <thead>
+            <tr>
+              <th className="jenkins-table__cell--tight">id</th>
+              <th data-sort-disable="true">pipeline</th>
+            </tr>
+          </thead>
+          <tbody>
+            {runs.map((run) => (
+              <SingleRun key={run.id} run={run} />
+            ))}
+          </tbody>
+        </table>
+      )}
+    </>
   );
 };